CN1249618A - Digital TV broadcast receiving equipment, and transmission and receiving system - Google Patents

Digital TV broadcast receiving equipment, and transmission and receiving system Download PDF

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Publication number
CN1249618A
CN1249618A CN99119141A CN99119141A CN1249618A CN 1249618 A CN1249618 A CN 1249618A CN 99119141 A CN99119141 A CN 99119141A CN 99119141 A CN99119141 A CN 99119141A CN 1249618 A CN1249618 A CN 1249618A
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China
Prior art keywords
signal
digital
broadcast receiving
information
ripple
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Granted
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CN99119141A
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Chinese (zh)
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CN100370825C (en
Inventor
谷口友彦
野原明
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication of CN1249618A publication Critical patent/CN1249618A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0874—Hybrid systems, i.e. switching and combining using subgroups of receive antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42202—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/4508—Management of client data or end-user data
    • H04N21/4524—Management of client data or end-user data involving the geographical location of the client
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division

Abstract

A digital TV broadcast receiving apparatus includes change means for receiving first through Nth signals and changing at least an (N-1)th signal among the received signals by feed-forward control: and addition means for adding the signals output from the change means. N is a natural number of 2 or greater.

Description

Digital TV broadcast receiving equipment and transmission and receiving system
The present invention relates to a kind of receiving digital television broadcast signal so that reduce the digital TV broadcast receiving equipment that the reception of broadcast singal is disturbed, and a kind of system that between transfer station and this receiving equipment, transmits and receive this digital signal.
For the reception of anolog TV signals, one of them reason that causes the signal skew that receives is that the multipath that radio wave reflection or scattering cause disturbs.The video image that is subjected to the multipath interference can produce distortion or temporary transient the interruption.For example, at publication number is in the Japanese patent application of 63-109676, a kind of method of removing ghost image from the fixing analog terrestrial television broadcast singal that receives is disclosed, this method is according to the reference signal that is inserted in the TV signal, the propagation characteristic of estimation radio wave also constitutes sef-adapting filter, thereby eliminates interference signal.
Yet,,, therefore be difficult to the propagation characteristic of estimation radio wave because along with moving of installing, propagation characteristic changes sharp for the mobile receiving system of terrestrial television signal.In this manual, term " mobile (mobile) " is used interchangeably with " motion (moving) ".
Recently, a kind of Digital Terrestrial Television Broadcast system has been proposed to solve this problem that exists in traditional analog terrestrial television broadcast system.This Digital Terrestrial Television Broadcast system is based upon on OFDM (OFDM) technical foundation.OFDM is the multi-carrier transmission technology, and it has prevented the multipath interference effectively.For example, for the intersymbol interference that prevents that the receive delay ripple from being caused, between original OFDM symbol, inserted a protection period that is called " protection at interval ".
Yet in mobile environment, frequency selective fading, the multipath fading etc. with Doppler (Doppler) frequency displacement have reduced quality of signals significantly.This is because the interference that reflected signal causes can not make the orthogonality condition of ofdm signal be met.And, for Digital Terrestrial Television Broadcast, designed a kind of SFN (Single Frequency Network) scheme.In the SFN scheme,, therefore, can effectively utilize frequency band owing to use identical frequency to transmit same TV programme from a plurality of transfer stations.This scheme is disturbed as multipath, has caused the decline of intersymbol interference and frequency characteristic inevitably.
According to one aspect of the present invention, a kind of digital TV broadcast receiving equipment is provided, it comprises: modifier is used to receive first to N signal, and utilizes feedfoward control to make that at least the N-1 signal changes in the received signal; Adder is used for the signal plus from modifier output; Wherein: N be 2 or than 2 big natural number.
According to another aspect of the present invention, a kind of digital TV broadcast receiving equipment is provided, it comprises: modifier is used to receive first to N signal, and makes according to external signal that at least the N-1 signal changes in the received signal; Adder is used for the signal plus from modifier output; Wherein: N be 2 or than 2 big natural number, and external signal obtains signal according to adder and produces.
In one embodiment of the invention, wherein said modifier is to be used to make the phase place of at least the N-1 signal to produce the phase changer that moves.
In one embodiment of the invention, wherein said modifier is to be used to make at least the N-1 signal to produce postpone so that change the deferred mount of at least the N-1 signal.
In one embodiment of the invention, wherein said modifier is to be used to make the phase place of at least the N-1 signal to produce the phase changer that moves of a regulation numerical value.
In one embodiment of the invention, wherein said modifier is to be used to make one cycle stipulated time of at least the N-1 signal delay so that change the deferred mount of at least the N-1 signal.
In one embodiment of the invention, described digital TV broadcast receiving equipment also comprises: input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and a plurality of signals of telecommunication is exported as first to N signal; Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion; Demodulating equipment, being used for the conversion of signals after the frequency inverted is baseband signal; Wherein: described deferred mount allows the delay cycle of described regulation at random to be provided with, and described adder allows addition at random to be provided with from the addition ratio of the signal of deferred mount output.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication; Amplifying device is used for amplifying a plurality of signals of telecommunication with the magnification ratio of a regulation, and amplifying signal is exported as first to N signal; Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion; Demodulating equipment is used for the signal demodulation after the frequency inverted; Postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With the addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the magnification ratio of one of them described regulation and the delay cycle of regulation, and to one of them amplifying device and the magnification ratio of described one of them the described regulation of deferred mount output and the delay cycle of regulation.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication; Receiving system is used for a plurality of signals of telecommunication are carried out frequency inverted, and the signal after a plurality of frequency inverted is exported as first to N signal; Demodulating equipment is used for the adder added signal is converted to baseband signal; Wherein said deferred mount allows the delay cycle of described regulation at random to be provided with, and described adder allows addition at random to be provided with from the addition ratio of the signal of deferred mount output.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and a plurality of signals of telecommunication is exported as first to N signal; Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion; Demodulating equipment, being used for the conversion of signals after the frequency inverted is baseband signal; Wherein said phase changer allows described regulation numerical value at random to be provided with, and described adder allows addition at random to be provided with from the addition ratio of the signal of phase changer output.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication; Amplifying device is used for amplifying a plurality of signals of telecommunication with the magnification ratio of a regulation, and amplifying signal is exported as first to N signal; Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion; Demodulating equipment is used for the signal demodulation after the frequency inverted; Postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With the addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the magnification ratio and the regulation numerical value of one of them described regulation, and export the magnification ratio of described one of them described regulation and stipulate numerical value to one of them amplifying device and phase changer.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication; Receiving system is used for a plurality of signals of telecommunication are carried out frequency inverted, and the signal after a plurality of frequency inverted is exported as first to N signal; Demodulating equipment is used for the adder added signal is converted to baseband signal; Wherein said phase changer allows described regulation numerical value at random to be provided with, and described adder allows addition at random to be provided with from the addition ratio of the signal of phase changer output.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With the addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the addition ratio of one of them described regulation and the delay cycle of regulation, and to one of them adder and the addition ratio of described one of them the described regulation of deferred mount output and the delay cycle of regulation.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With the addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the addition ratio and the regulation numerical value of one of them described regulation, and export the addition ratio of described one of them described regulation and stipulate numerical value to one of them adder and phase changer.
In one embodiment of the invention, wherein said delay ripple estimating apparatus receives the signal of the expression demodulation state that obtains by demodulating equipment, and estimation comprise postpone intensity of wave, postpone differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave.
In one embodiment of the invention, wherein the addition control device comprises the delay cycle control device with variable impedance element, and is applied to the delay cycle that voltage on the variable impedance element is controlled described regulation by variation.
In one embodiment of the invention, wherein the addition control device comprises the phase control device with variable impedance element, and controls described regulation numerical value by the voltage that variation is applied on the variable impedance element.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for according to signal from position detecting device, determine the state of the radio wave at receiving position place, wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio of one of them regulation and the time expand of regulation.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for according to signal from position detecting device, determine the state of the radio wave at receiving position place, wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio and the regulation numerical value of one of them regulation.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: speed detector is used to detect the translational speed of digital TV broadcast receiving equipment; Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for according to from the signal of position detecting device with from the signal of speed detector, determine the state of the radio wave at receiving position place, wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio of one of them regulation and the delay cycle of regulation.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: speed detector is used to detect the translational speed of digital TV broadcast receiving equipment; Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for according to from the signal of position detecting device with from the signal of speed detector, determine the state of the radio wave at receiving position place, wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio and the regulation numerical value of one of them regulation.
In one embodiment of the invention, wherein speed detector and position detecting device are navigation system.
The reduction of signal gain when in one embodiment of the invention, wherein amplifying device has remedied signal distributions.
In one embodiment of the invention, wherein input unit comprises a plurality of antennas with different receiving features.
According to another aspect of the present invention, a kind of digital TV broadcast receiving equipment is provided, comprising: input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication; Receiving system is used for a plurality of signals of telecommunication that input unit obtains are carried out frequency inverted; Demodulating equipment, being used for the conversion of signals after a plurality of frequency inverted is baseband signal; Postpone the ripple estimating apparatus, be used to receive the information of the demodulation state that relevant demodulating equipment obtains, and estimation is included in the delay ripple information in the electromagnetic wave; Conciliate regulation and control system device, be used for producing a control signal according to postponing ripple information, this control signal is used to control the transfer function that demodulating equipment is handled.
In one embodiment of the invention, demodulating equipment wherein comprises: the frequency analysis device is used for a plurality of signals that obtain by receiving system are carried out frequency inverted; Adjusting device is used for a plurality of signals that obtain by the frequency analysis device are operated; Decoding device is used for a plurality of signals that obtain by adjusting device are decoded; Postpone the ripple estimating apparatus, according to the information about demodulation state that obtains by decoding device, estimation comprises and postpones intensity of wave, postpones differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave; The demodulation control device produces control signal according to postponing ripple information, with the transfer function of regulating and controlling device, and this control signal is offered adjusting device.
In one embodiment of the invention, demodulating equipment wherein comprises: the frequency analysis device is used for a plurality of signals that obtain by receiving system are carried out frequency inverted; Adjusting device is used for a plurality of signals that obtain by the frequency analysis device are operated; Decoding device is used for a plurality of signals that obtain by adjusting device are decoded; Postpone the ripple estimating apparatus, according to obtain by decoding device about the information of demodulation state and the signal that obtains from the frequency analysis device, estimation comprises and postpones intensity of wave, postpones differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave; The demodulation control device produces control signal according to postponing ripple information, with the transfer function of regulating and controlling device, and this control signal is offered adjusting device.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for according to signal from position detecting device, determine the state of the radio wave at receiving position place, wherein, the demodulation control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produce a control signal, and this control signal is offered adjusting device.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: speed detector is used to detect the translational speed of digital TV broadcast receiving equipment; Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for receiving position according to translational speed that is detected and detection, determine the state of the radio wave at receiving position place, wherein, the demodulation control device is according to by postponing delay ripple information that the ripple estimating apparatus obtains and determining the signal that radio wave state that device obtains and frequency analysis device obtain by positional information, produce a control signal, and this control signal is offered adjusting device.
In one embodiment of the invention, speed detector wherein and position detecting device are navigation system.
In one embodiment of the invention, input unit wherein comprises a plurality of antennas with different receiving features.
According to another aspect of the present invention, a kind of digital TV broadcast receiving equipment is provided, it comprises: input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication; Receiving system is used for a plurality of signals of telecommunication that obtain by input unit are carried out frequency inverted; Adder, a plurality of signals that are used for obtaining by receiving system carry out addition; Demodulating equipment, the signal that is used for obtaining by adder carries out demodulation; Postpone the ripple estimating apparatus, be used to receive the signal of the demodulation state that expression obtains by receiving system, and estimation is included in the delay ripple information in the electromagnetic wave; With the addition control device, be used for according to postponing ripple information, control adder and receiving system; Wherein said receiving system, according to the information that obtains by the addition control device, the frequency shift amount during the control frequency conversion; Adder, according to the information that obtains by the addition control device, the addition ratio of a plurality of signals that the control addition obtains by receiving system.
In one embodiment of the invention, described addition control device wherein comprises: gain control, according to postponing ripple information, determine the addition ratio; The reference signal control device, each that is used for a plurality of signals is provided with the frequency of reference signal, and this frequency is being used when ripple information is carried out frequency inverted by receiving system according to postponing.
In one embodiment of the invention, delay ripple estimating apparatus in this apparatus of digital television receiving receives the signal of the demodulation state that expression obtains by demodulating equipment, and estimation comprise postpone intensity of wave, postpone differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, is used for according to the receiving position that is detected, and determines the state of the radio wave at receiving position place; Wherein the addition control device according to postponing ripple information and radio wave state, is controlled adder and receiving system.
In one embodiment of the invention, this apparatus of digital television receiving also comprises: speed detector is used to detect the translational speed of digital TV broadcast receiving equipment; Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment; Positional information is determined device, be used for determining the state of the radio wave at receiving position place, wherein the addition control device according to translational speed that is detected and the receiving position that is detected, according to postponing ripple information and radio wave state, control adder and receiving system.
In one embodiment of the invention, speed detector wherein and position detecting device are navigation system.
In one embodiment of the invention, input unit wherein comprises a plurality of antennas with different receiving features.
In one embodiment of the invention, demodulation state is wherein represented by the pilot signal that is included in the electromagnetic wave.
In one embodiment of the invention, positional information wherein determines that device obtains the position of transfer station, and according to the position of information that obtains by the information of vehicles checkout gear and transfer station, the state of the radio wave at estimation receiving position place.
In one embodiment of the invention, positional information is wherein determined the device state of the radio wave of a plurality of positions of storage in advance, and according to the information that obtains by the information of vehicles checkout gear, the radio wave state at estimation receiving position place.
In one embodiment of the invention, positional information wherein determines that device with the interval of regulation or arbitrarily at interval, obtain the radio wave state of a plurality of positions, upgrade the radio wave state of a plurality of positions, and according to the information that obtains by the information of vehicles checkout gear, the radio wave state at estimation receiving position place.
In one embodiment of the invention, the reception information data of the accepting state of a plurality of positions of expression is transmitted in a broadcasting station, and aforesaid digital TV broadcast receiving equipment receives the reception information data that transmit in described broadcasting station, thus the estimation radio wave state.
In one embodiment of the invention, positional information wherein determines that device with the interval of regulation or arbitrarily at interval, obtain the radio wave state of a plurality of positions, and determine information that device obtains and in the accepting state of a plurality of positions, the radio wave state at estimation receiving position place according to the information that obtains by the information of vehicles checkout gear or by positional information.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises: the error ratio measure portion, be used to measure signal errors ratio at the demodulating equipment place, wherein when error ratio surpasses the setting in cycle stipulated time, the error ratio measure portion produces a control signal, wherein, input unit comprises that one selects part, is used for according to selecting an output signal from the control signal of error ratio measure portion.
In one embodiment of the invention, addition control device wherein is according to the signal that postpones the output of ripple estimating apparatus, produce the control signal of the addition ratio of a change adder, surpass the corresponding signal of signal of a setting with decay and its error ratio in demodulating equipment.
Selection timing when in one embodiment of the invention, input unit is wherein selected output signal is equal to or greater than the standard value of received signal.
Change timing when in one embodiment of the invention, the addition ratio of adder wherein changes is equal to or greater than the standard value of received signal.
In one embodiment of the invention, the selection timing when input unit is wherein selected output signal is in the received frame of received signal, or in the interval that equals a standard value, or in arbitrary frame.
In one embodiment of the invention, the change timing when wherein the addition ratio of adder changes is in the received frame of received signal, or in the interval that equals a standard value, or in arbitrary frame.
In one embodiment of the invention; wherein the time of the regulation numerical value of the magnification ratio of the delay cycle of the addition ratio of adder, deferred mount, amplifying device or phase changer renewal is the protection period of received signal, or the next-door neighbour's time of significant character before or after the cycle.
In one embodiment of the invention, wherein input unit comprises a plurality of antennas, and the installation site of at least one antenna in a plurality of antenna is different in time and change.
In one embodiment of the invention, can control the distance of at least one antenna according to the wavelength of the TV signal that will receive.
In one embodiment of the invention, the distance between the installation site of at least two antennas is shorter than the wavelength of the TV signal that will receive in a plurality of antennas.
According to one aspect of the present invention, a kind of digital TV broadcast receiving equipment is provided, it comprises: input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication; Amplifying device will amplify by a plurality of signals that input unit obtains; Deferred mount is for a plurality of signals that obtain by amplifying device provide a delay cycle; Adder, a plurality of signals that are used for obtaining by deferred mount carry out addition; Frequency conversion apparatus, the conversion of signals that is used for obtaining by adder is a baseband signal; Demodulating equipment, the signal that is used for obtaining by frequency conversion apparatus carries out demodulation; Speed detector is used to obtain the translational speed information of mobile object; The accepting state estimating apparatus is used to obtain the multipath disturbance state; Gain control is used for according to multipath disturbance state and translational speed information, the magnification ratio of control amplifying device; With the delay cycle control device, be used for according to multipath disturbance state and translational speed, control will offer the delay cycle of deferred mount.
In one embodiment of the invention, when the translational speed of mobile object is that low speed or mobile object stop when mobile, the delay cycle control device changes delay cycle in time.
In one embodiment of the invention, wherein the delay cycle control device is determined the variation numerical value of delay cycle according to the transmission system of received signal.
In one embodiment of the invention, wherein the accepting state estimating apparatus obtains information with the input state that uses relevant input unit.
In one embodiment of the invention, wherein said amplifying device has a plurality of magnification ratios, to amplify a plurality of signals of telecommunication that obtain by input unit; Described gain control, according to the receiving feature of received signal, a plurality of magnification ratios of control amplifying device.
In one embodiment of the invention, wherein the delay cycle control device is determined the upper limit of the variable quantity of delay cycle according to the transmission system of received signal.
According to one aspect of the present invention, a kind of digital TV broadcast receiving equipment is provided, comprising: input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication; Amplifying device will amplify by a plurality of signals that input unit obtains; Phase changer is for a plurality of signals that obtain by amplifying device provide a number of phase-shift values of stipulating; Adder, a plurality of signals that are used for obtaining by phase changer carry out addition; Frequency conversion apparatus, the conversion of signals that is used for obtaining by adder is a baseband signal; Demodulating equipment, the signal that is used for obtaining by frequency conversion apparatus carries out demodulation; Speed detector is used to obtain the translational speed information of mobile object; The accepting state estimating apparatus is used to obtain the multipath disturbance state; Gain control is used for according to multipath disturbance state and translational speed information, the magnification ratio of control amplifying device; And phase control device, be used to control the number of phase-shift values that will offer phase changer.
In one embodiment of the invention, wherein when the translational speed of mobile object be that low speed or mobile object stop when mobile, phase control device changes the phase number of regulation in time.
In one embodiment of the invention, wherein phase control device is determined the variation numerical value of the phase number of regulation according to the transmission system of received signal.
In one embodiment of the invention, wherein the accepting state estimating apparatus obtains information with the input state that uses relevant input unit.
In one embodiment of the invention, wherein said amplifying device has a plurality of magnification ratios, to amplify a plurality of signals of telecommunication that obtain by input unit; Described gain control, according to the receiving feature of received signal, a plurality of magnification ratios of control amplifying device.
In one embodiment of the invention, wherein phase control device is according to the transmission system of received signal, determines the upper limit of variable quantity of the phase number of regulation.
In one embodiment of the invention, wherein the addition control device comprises: gain control is used for determining the addition ratio according to postponing ripple information; The reference signal control device is used to be provided with reference signal, makes that the phase place for the reference signal of a plurality of signals is different, and this reference signal is used when receiving system carries out frequency inverted.
In one embodiment of the invention, wherein postpone the ripple estimating apparatus and receive the signal of the demodulation state that expression obtains by demodulating equipment, and estimation comprise postpone intensity of wave, postpone differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave.
In one embodiment of the invention, this digital TV broadcast receiving equipment also comprises amplifying device, the reduction of signal gain when it is used to remedy signal distributions.
Described hereinly the invention provides a kind of digital TV broadcast receiving equipment, this equipment can alleviate the reception of the numerical data when receiving data in moving to be disturbed, and a kind of system that transmits and receive this data between station and this digital TV broadcast receiving equipment is provided.
To those skilled in the art,, read and understood, be easy to see above-mentioned these and other advantages of the present invention with after the relevant detailed description of the present invention in lower part at the reference accompanying drawing.
Fig. 1 is the block diagram of a digital TV broadcast receiving equipment of the present invention;
Fig. 2 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Fig. 3 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Fig. 4 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Fig. 5 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Fig. 6 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Fig. 7 is the conceptual diagram of frequency analysis that is subjected to postponing the signal of wave interference (jammed) when the equipment that is received receives;
Fig. 8 is the conceptual diagram of the gain controlling of adder execution;
Fig. 9 is the conceptual diagram that concerns between the delay cycle of error ratio and delay ripple;
Figure 10 is the flow chart that antenna switches;
Figure 11 is a kind of method figure that is used for the delay cycle of control lag device;
Figure 12 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 13 is the structured flowchart of receiving system;
Figure 14 is the structured flowchart of another receiving system;
Figure 15 is the structured flowchart of another receiving system;
Figure 16 is an antenna diagram;
Figure 17 is the enlarged drawing of Figure 16;
Figure 18 A is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 18 B is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 18 C is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 18 D is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 19 is the structured flowchart of phase changer;
Figure 20 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 21 is the operation schematic flow diagram of delay cycle control device;
Figure 22 is the block diagram of another digital TV broadcast receiving equipment of the present invention;
Figure 23 A and 23B receive the curve chart that the reception error that occurs in the environment that disturbs produces situation having relative strong cohesiveness;
Figure 24 be applied on the variable impedance element voltage and with the graph of relation between the phase-shift phase of this change in voltage;
Figure 25 A, 25B and 25C are voltage and the time relation curve charts that is applied on the phase shift section;
Figure 26 is the structured flowchart of another receiving system;
Figure 27 is the structured flowchart of input unit;
Figure 28 is the schematic configuration diagram of ofdm signal;
Figure 29 is the schematic configuration diagram that simulated television transmits signal;
Figure 30 is the protection gap periods and the schematic diagram in significant character cycle.
With the lower part, in the mode of embodiment the present invention is described with reference to the accompanying drawings.
Embodiment 1
With reference to Fig. 1 digital TV broadcast receiving equipment in the first embodiment of the present invention is described.Fig. 1 is the block diagram of the digital TV broadcast receiving equipment among first embodiment.
As shown in Figure 1, the digital TV broadcast receiving equipment among first embodiment comprises: input unit 1, deferred mount 2, adder 3, receiving system 4, demodulating equipment 5, addition control device 6 and delay ripple estimating apparatus 7.
This digital TV broadcast receiving equipment is operated in following mode.
The radio wave of television broadcasting is converted to the signal of telecommunication by the reception antenna 11 in the input unit 1 for example, and is sent to deferred mount 2 and adder 3.Particularly, the television broadcasting signal that has been converted to the signal of telecommunication is according to the delayed control signal that transmits from addition control device 6, and delayed device 2 postpones, and is sent to adder 3 then.On each signal that adder 3 is added to gain on each signal that transmits from input unit 1 and transmits from deferred mount 2, then with these two signal plus.Added signal is sent to receiving system 4.This addition can select such simple operations to realize by for example addition and maximum.
The control of the delay cycle that deferred mount 2 is carried out will be described below.
The frequency band of the signal that deferred mount 2 is handled is the frequency band of TV signal.Therefore, deferred mount 2 can pass through, and for example utilizes switch to select in a plurality of path P 1 to PN one, comes the delay cycle of control signal.These a plurality of path P 1 to PN can be the holding wires with different length.Switch shown in Figure 11 can be selected in a plurality of path P 1 to PN one according to the delayed control signal that addition control device 6 obtains.
These a plurality of path P 1 to PN can be the holding wires with unlike signal transmission characteristic.In this case, switch shown in Figure 11 still can be selected in a plurality of path P 1 to PN one according to the delayed control signal that addition control device 6 obtains.
Deferred mount 2 as shown in Figure 1, its can by utilize the voltage control variable impedance element with substitute as shown in Figure 11 the length of utilizing the switch toggle path or the propagation characteristic of signal move each phase place.
Turn back to Fig. 1, receiving system 4 extracts the signal of required frequency band from the signal that adder 3 obtains.Then, receiving system 4 is the signal with the frequency that can be handled by demodulating equipment 5 with the conversion of signals of being extracted, and transfers the signal to the demodulating equipment 5.This demodulating equipment 5 demodulation one received signal, and this signal outputed to postpone ripple estimating apparatus 7.In other words, demodulating equipment 5 offers demodulating information and postpones ripple estimating apparatus 7.
The demodulating information that this delay ripple estimating apparatus 7 obtains according to demodulating equipment 5 is estimated receiving the delay ripple that comprises in the ripple.For example, the information that this delay ripple estimating apparatus 7 obtains according to demodulating equipment 5, in many deferred messages at least one estimated, that is: be included in delay intensity of wave in the signal that input unit 1 receives, postpone intensity of wave, through intensity of wave, postpone between ripple and the direct wave phase difference and with respect to the delay cycle of the delay ripple of direct wave.
Below the method that be in harmonious proportion to postpone the ripple estimation is separated in description.
In the digital terminal television broadcasting of Japan, for those are attempting making the standardized plane wave digital broadcasting of broadcast system, use OFDM (OFDM) pattern usually as modulating system.This demodulating equipment 5 is carried out the OFDM demodulation so that the code that is received is decoded.This decoding processing comprises for example utilizes that FFT (fast fourier transform) carries out frequency analysis.When using FFT to carry out frequency analysis, according to the result of frequency analysis, the position and the quantity of the negative area by detecting the received signal frequency component detect delay cycle.In addition, demodulating equipment 5 utilizes the various pilot signals that are included in the signal that is received, and data are carried out demodulation.Demodulating equipment 5 utilizes the transmission characteristic of pilot signal estimating signal.
Fig. 7 is when the delay ripple exists, the curve chart that the ofdm system medium frequency is analyzed.As shown in Figure 7, when the delay ripple existed, a plurality of frequency components comprised a negative area (dip), and when the delay ripple did not exist, frequency characteristic was smooth (not shown).
When a plurality of frequency components comprise a negative area, that is: comprise one when postponing ripple when received signal, this postpones ripple estimating apparatus 7 and postpones ripple by observing the variation in the pilot signal or the deletion of pilot signal, detecting.
When received signal comprises one when postponing ripple, the correction process of this delays ripple estimating apparatus 7 by carrying out after the FFT can obtain the information about the position of the data that include error, and estimates the delay cycle of disturbing wave according to this information.
Foregoing description is at the digit broadcasting system in Japan, and the digit broadcasting system that the present invention also is suitable for analog broadcast system and uses at country variant.For example, the present invention is suitable for ofdm system single carrier transmission system in addition.
With the lower part setting of addition gain and the generation of delay cycle will be described exemplarily.
Addition control device 6 is according to postponing the delay ripple information that ripple estimating apparatus 7 provides, and output is used for the signal of control lag device 2 and adder 3.As shown in Figure 1, addition control device 6 comprises gain control 61 and delay cycle control device 62.
Gain control 61 is provided with the addition gain according to postponing the delay ripple information that ripple estimating apparatus 7 obtains at adder 3 places.The setting of addition gain 8 is described with reference to the accompanying drawings hereinafter.Suppose that deferred mount 2 (Fig. 1) comprises first decay part and second decay part.In Fig. 8, the trunnion axis representative postpones the amplitude of ripple, and the gain of vertical axis represents signal A is with respect to the ratio (signal A gain/signal B gain) of signal B gain.The gain of signal A gain representative 3 signals that transmit from first decay part to adder, the gain of signal B gain representative 3 signals that transmit from second decay part to adder.
When the level that postpones ripple was higher than reference level, particularly when the level that postpones ripple is identical with the level of direct wave basically, gain control 61 was controlled and will be postponed ripple and add up to direct wave and have identical gain.
When the level that postpones ripple is lower than reference level or is higher than the level of direct wave, gain control 61 is for example controlled adder 3 reducing from the gain of the signal of deferred mount 2 or from the gain of the signal of input unit 1, thereby this delay ripple is added with direct wave and has different gains.
When the delay cycle of the delay ripple that obtains according to delay ripple estimating apparatus 7 is carried out gain controlling, gain control 61 is for example controlled adder 3, thus when delay cycle long (curve among Fig. 8 a) time the delay ripple and the gain inequality between the direct wave greater than delay ripple when delay cycle is lacked (the curve b among Fig. 8) and the gain inequality between the direct wave.
The operation of delay cycle control device 62 (Fig. 1) is as follows.Under the control of delay cycle control device 62, the delay cycle that signal need postpone in the deferred mount 2 is provided with identically with the delay cycle that postpones 7 estimations of ripple estimating apparatus basically.
Fig. 9 is the exemplary graph that concerns between the error ratio of delay ripple and restituted signal.Shown in 9, (put B) more in short-term when delay cycle less than 2.5 μ s, error ratio is tending towards sharp increase.Delay cycle control device 62 is by being arranged on delay cycle the level (default value) of one regulation, and for example about 2.5 μ s or longer postpone ripple estimating apparatus 7 resulting values and replace,, can avoid this growth in the error ratio effectively.The wrong identification of term " error " expression received signal.Term " error ratio " expression, for example ratio between correct signal number and the error signal number.
The time-delay upper limit must be lower than the protection period that is added on the ofdm signal.The delay cycle that deferred mount 2 always is provided with a regulation to prevent owing to postpone the increase that ripple has the error ratio that short relatively delay cycle causes.Twice (that is: about 5 μ s) by delay cycle being set at the B point value can reduce the influence of the delay ripple with short time delay cycle to a certain extent.
When signal is received by antenna shown in Figure 1, might be than short given this signal of delay cycle of value of the inverse of the bandwidth of received signal, and this inhibit signal is added on the received signal, and the noise level that generates signal like this is lowered, thereby has reduced error ratio.This is possible, because the position of the negative area that signal produced that addition obtains is in the outside of signal bandwidth.For example, when signal bandwidth is 500kHz, need adds 2 μ s or be lower than the delay cycle of 2 μ s.This system of signal with short time delay cycle that adds is at the incoming level of the frequency that improves received signal, and is particularly very effective in the Narrowcasting of using as the service broadcasting of mobile receiving system.
When the digital TV broadcast receiving equipment shown in Fig. 1 was installed on the vehicle, this equipment comprised that also positional information determines device 8 and information of vehicles checkout gear 9.Even if be not installed on the vehicle, this digital TV broadcast receiving equipment in first embodiment can comprise that also positional information determines device 8 and information of vehicles checkout gear 9.
To describe the signal that is installed to the digital TV broadcast receiving equipment on the vehicle among first embodiment below and receive operation.
Be used to detect the relevant information of vehicles checkout gear 9 of the information of mobile vehicle, comprise: speed detector 91 and position detecting device 92.
Speed detector 91 detects the speed of the vehicle of received signal in moving, and position detecting device 92 detects the position of vehicle.Guider can be used for information of vehicles checkout gear 9.The such road surveillance of GSP device, PHS unit, cell phone and for example VICS can be used as position detecting device 92.Information of vehicles checkout gear 9 detected information of vehicles are sent to positional information and determine device 8.
Positional information determines that device 8 obtains such as information such as landform, and finds the digital television broadcasting station, wherein can receive the radio wave from this digital television broadcasting station in the position of receiving digital television broadcast (receiving position).This positional information is determined device 8 under the situation of the distance between consideration receiving position and the transfer station or mountain or building reflection radio wave, and estimation is in the delay cycle or the intensity of the radio wave at receiving position place.In order to carry out these functions, positional information is determined device 8 storages about from transfer station, and as broadcasting station or relay station, the frequency of the signal of transmission, the position of transfer station and signal transmit similar information such as output.These information can be by occupying or storing as downloads such as broadcasting or telephone wires through communicator.Positional information determines that device 8 compares these information and the positional information that obtains from information of vehicles checkout gear 9, finds out the delay cycle or the intensity of the radio wave at acceptance point place.
Positional information intensity device 8 can also illustrate on the map relevant for example, near the position of the building this acceptance point, size and height and this are broadcasted the position of map.By considering the factors such as reflection of building, can more accurately find out the delay cycle and the intensity of radio wave.For example: navigation system is used to handle the information about transfer station, building and mountain peak etc.
Because speed detector 91 is provided at the speed of the vehicle of received signal in the moving process, so can estimate the delay ripple that will occur next time.Therefore, compared with the system that does not consider car speed, postponing ripple can be detected quickly.
Addition control device 6 is determined the delay ripple information that device 8 obtains according to positional information, carries out the control of addition gain controlling and delay cycle.Mode of operation when the executive mode of this addition gain controlling and delay cycle control is similar to the delay ripple information that obtains when delay ripple estimating apparatus 7 and is used.
Information and positional information that delay ripple estimating apparatus obtains determine that the information that device 8 obtains can make up.In this case, when having only the content of the delay ripple information that obtains when device 7 and 8 close each other, just carry out the control of gain controlling and delay cycle.When the content of the device 7 and 8 delay ripple information that obtain differs greatly each other, keep the present situation, or, carry out the control of gain controlling and delay cycle according to showing the more information of high latency ripple level.
In the foregoing description, information of vehicles checkout gear 9 comprises speed detector 91 and position detecting device 92.In addition, the information of vehicles checkout gear also can only comprise position detecting device 92.Even have such structure, no matter vehicle is moving or in the fixed position, can receive signal.
In Fig. 1, input unit 1 comprises antenna 11 and amplifying device 12.According to the present invention, the quantity of antenna can be two or more.Time-delay part is corresponding with in a plurality of antennas each.
Fig. 2 is the block diagram of a digital TV broadcast receiving equipment, and wherein, input unit 1 comprises a plurality of antennas 11, and deferred mount 2 comprises the corresponding decay part of a plurality of and a plurality of antenna 11 (that is: first decay part ... N decay part).The digital broadcast television receiving equipment is operated in the following manner.
When a plurality of antennas 11 received identical broadcasts radio waves, a plurality of antennas 11 were subjected to the interference that multipath disturbs in a different manner.Thereby a plurality of antennas 11 provide different output signals.These signals have the negative area as shown in Figure 7 of different depth at diverse location (frequency).
In other words, its negative area signal of being positioned at diverse location or having a different depth is by obtaining a plurality of different received signal additions.Its result: reduced error ratio (that is: the wrong identification ratio of received signal).
In deferred mount 2, the delay cycle that addition control device 6 obtains is arranged at respectively in its first to N decay part.Adder 3 is provided with the gain that addition control device 6 obtains according to inhibit signal, except the operation of said elements, the digital TV broadcast receiving equipment among Fig. 2 with figure in the similar mode of digital TV broadcast receiving equipment operate.
When a plurality of antennas 11 with 1/4 TV signal wavelength or when more install at long wavelength's interval, reduced relevant between a plurality of input signals.Therefore, by having improved the quality of received signal from a plurality of input signal additions of a plurality of antennas 11.
When the direction of a plurality of antennas 11 and polarity not simultaneously, can further reduce relevant between a plurality of input signals.By with these a plurality of input signal additions, can further improve the quality of received signal.
In Fig. 2, each from a plurality of signals of deferred mount 2 output all has one and gains accordingly with control signal from gain control 61, and the signal that is generated is added.In addition, as shown in figure 15, according to control signal from gain control 61, can given first to N gain that the amplifier section (not shown) is different.
As mentioned above, the digital TV broadcast receiving equipment among first embodiment is the signal plus of self-dalay device 2 in the future, with the negative area in the attenuated signal, consequently: the error ratio that has reduced numerical data.
Avoid the growth of error ratio by setting delay cycle, thereby avoided having the influence of the signal in short time delay cycle.
By avoiding the negative area in the signal more accurately, also can avoid the growth of error ratio.Determine that by utilizing delay ripple estimating apparatus 7, information of vehicles checkout gear 9 and positional information device 8 obtains accurate ripple, the negative area in the attenuated signal more accurately of postponing.
As following described, can be switched use according to error condition from the signal of a plurality of antennas with reference to Figure 10.
Figure 10 is the flow chart of the operation of switched antenna.
At first, the C/N ratio (carrier wave/noise ratio) of signal is input to antenna 11 (Fig. 2), and obtains the reception error generation state in certain hour cycle interior (that is: in the frame period) in the past.When the C/N ratio was higher than a threshold value (" Yes " among the step S100) and error ratio and is lower than a threshold value (" Yes " among the step S100), antenna was not switched (step S102).
Being that convenient error ratio is not less than this threshold value, is that form with burst appears in the cycle in short-term but not (" Yes " among the step S103) routinely occur if error produces, and antenna is not switched (step S102).
When the C/N ratio is not higher than this threshold value (" No " among the step S100), or error ratio is when being not less than this threshold value (" No " among the step S101), and error is created in and occurs (" No " among the step S103) in the cycle in short-term continuously, and then antenna is switched (step S104).
The sequential of switched antenna can be calculated according to the speed and the position of vehicle.
Antenna can switch the unit at interval according to the protection that is added on the OFDM.In this case, the variation in the time of can moving corresponding to vehicle in the signal reception condition and obtain the best sequential of switched antenna.
Embodiment 2
The digital TV broadcast receiving equipment of second embodiment of the invention is described with reference to Fig. 3.Fig. 3 is the block diagram of digital TV broadcast receiving equipment among second embodiment.
Digital TV broadcast receiving equipment among second embodiment comprises: import this 1, deferred mount 2, adder 3, receiving system 4, demodulating equipment 5, addition control device 6 and postpone ripple estimating apparatus 7.Addition control device 6 comprises: gain control 61 and delay cycle control device 62.When the digital TV broadcast receiving equipment among second embodiment was mounted on an object that is moving such as the vehicle, this equipment comprised that also positional information determines device 8 and information of vehicles checkout gear 9.Information of vehicles checkout gear 9 comprises speed detector 91 and position detecting device 92.Be digital TV broadcast receiving equipment among convenient second embodiment when not being mounted on the vehicle, this digital TV broadcast receiving equipment among second embodiment can comprise that also positional information determines device 8 and information of vehicles checkout gear 9.
Equipment in first embodiment comprises a receiving system 4, and it is right after after adder 3, and this equipment also comprises this receiving system 4 in a second embodiment, but it is right after after input unit 1.
Below description is installed in the digital TV broadcast receiving equipment on the vehicle signal receive the example of operation.
The radio wave of television broadcasting is converted to the signal of telecommunication by the reception antenna 11 in the input unit 1 for example, and is sent to receiving system 4.This receiving system 4 only extracts the signal of required frequency band and this signal is transferred to deferred mount 2 and adder 3 in the signal that input unit 1 obtains.The signal that receiving system 4 obtains is delayed device 2 according to the delayed control signal that transmits from addition control device 6 to postpone, and is sent to adder 3 then.Adder 3 is according to the phase increase control signal that transmits from addition control device 6, on each signal that gain is added on each signal that transmits from input unit 1 and transmits from deferred mount 2 (weighting), then with these two signal plus.Added signal is sent to demodulating equipment 5.This addition can select such simple operations to realize by for example addition and maximum.Demodulating equipment 5 is separated to be in harmonious proportion and is exported this signal.
Postpone ripple estimating apparatus 7 and postpone ripple according to the demodulating information estimation that transmits from demodulating equipment 5, and with first embodiment in the similar mode described, should postpone ripple and be transferred to addition control device 6.Positional information is determined device 8 according to the mobile reception information that transmits from information of vehicles checkout gear 9, and estimation postpones ripple, and will postpone ripple to be transferred to addition control device 6 with the similar mode of first embodiment.
Addition control device 6 obtains the control signal (delay cycle and addition ratio) of deferred mount 2 and adder 3 according to determining the signal of device 8 from postponing ripple estimating apparatus 7 and positional information.
In signal received, addition control device 6 and information of vehicles checkout gear 9 were to operate with the similar mode of first embodiment.In the equipment of second embodiment, the signal band that deferred mount 2 and adder 3 occupy is subjected to the restriction of receiving system 1.Therefore, deferred mount 2 is compared with first embodiment with the processing that adder 3 is carried out and is simplified, but effect is equivalent.
The frequency band of the signal that deferred mount 2 is handled is lower than the frequency band among first embodiment.Therefore, when deferred mount 2 inhibit signals, delay cycle is subjected to the control that input signal is converted into the Digital Signal Processing after the digital signal.
Digital TV broadcast receiving equipment among second embodiment shown in Figure 4, input unit 1 have a plurality of antennas 11, and receiving system 4 has first to N receiving unit.This deferred mount 2 has first to N decay part.
The class of operation of digital TV broadcast receiving equipment shown in Figure 4 is not describing in detail here like aforesaid operations.
When a plurality of antennas 11 received identical broadcasts radio waves in the equipment at Fig. 4, a plurality of antennas 11 were subjected to the influence that multipath disturbs in a different manner.Thereby a plurality of antennas 11 provide different output signals.These signals have the negative area as shown in Figure 7 of different depth (not shown) in diverse location place (frequency).The signal of negative area that has at the diverse location place or have a different depth is by obtaining a plurality of received signal additions.Its result has reduced error ratio.
Embodiment 3
With reference to Fig. 5 digital TV broadcast receiving equipment in the third embodiment of the present invention is described.Fig. 5 is the block diagram of the digital TV broadcast receiving equipment among the 3rd embodiment.
Digital TV broadcast receiving equipment among the 3rd embodiment comprises: input unit 1, receiving system 4, demodulating equipment 5, delay ripple estimating apparatus 7 are conciliate regulation and control system devices 55.When the digital TV broadcast receiving equipment among the 3rd embodiment was mounted on an object that is moving such as the vehicle, this equipment comprised that also positional information determines device 8 and information of vehicles checkout gear 9.Promptly this digital TV broadcast receiving equipment of box lunch is not when being mounted on the vehicle, and this digital TV broadcast receiving equipment among the 3rd embodiment can comprise that also positional information determines device 8 and information of vehicles checkout gear 9.
Describe with reference to Fig. 5 and to be arranged in the fixed position and in the operational instances of the digital TV broadcast receiving equipment of the 3rd embodiment that moves.Positional information determines that device 8 and information of vehicles checkout gear 9 and second embodiment are similar, is not repeating here.
The radio wave of television broadcasting is converted to the signal of telecommunication by the reception antenna 11 in the input unit 1 for example, and is sent to receiving system 4.This receiving system 4 only extracts the signal of required frequency band and this signal is transferred to demodulating equipment 5 in the signal that input unit 1 obtains.These demodulating equipment 5 demodulation are exported the signal that generates from the signal of receiving system 4, and the demodulation situation is transferred to delay ripple estimating apparatus 7.
Below will describe the operation of demodulating equipment 5 in detail.
Demodulating equipment 5 comprises: frequency analysis device 51, adjusting device 52 and decoding device 53.
The signal that frequency analysis device 51 obtains receiving system 4 with for example FFT, real-time FFT, DFT or FHT equifrequent analytical method carries out the processing of frequency analysis.Signal after frequency analysis is transferred to adjusting device 52.Signal after this frequency analysis is represented by the frequency and the amplitude of for example signal.
Adjusting device 52 is according to the control signal from demodulation control device 55, and the signal on the frequency axis that frequency analysis device 51 is obtained is operated.This operation can be passed through, for example according to will apply from the signal that frequency analysis device 51 obtains from the signal of demodulation control device 55 transfer function realize, by utilizing a filter to calculate to realize or by strengthening a specific frequency components or inserting one and think and want deleted frequency component to realize.The signal decoding that this decoding device 53 obtains adjusting device 52 is a digital code.
Postpone ripple estimating apparatus 7 according to the signal that obtains from demodulating equipment 5, estimation postpones ripple information.At this point, can carry out the pilot signal that obtains during the decode operation with reference to frequency spectrum that obtains from frequency analysis device 51 or decoding device 53.
Fig. 7 is the spectrum curve figure of received signal.Usually, the digital television broadcasting of in the OFDM modulating mode, using, frequency spectrum is smooth.When having the delay ripple, as shown in Figure 7, produce negative area.Therefore, the size that postpones the delay cycle of ripple can be estimated.
The size of delay cycle can be estimated according to the phase shift or the deletion of pilot signal.
Demodulation control device 55 is determined the delay ripple information that device 8 obtains, regulating and controlling device 52 according to postponing ripple estimating apparatus 7 or positional information.(a plurality of) Control Parameter that demodulation control device 55 is determined corresponding to adjusting device 52, and should (a plurality of) Control Parameter be transferred to adjusting device 52.For example, when adjusting device 52 needs one when postponing the transfer function of ripple, demodulation control device 55 finds corresponding to the transfer function that postpones ripple, and this transfer function is delivered to adjusting device 52.When adjusting device 52 was a filter, control set for adjusting 55 was sent to adjusting device 52 with (a plurality of) filter coefficient.When adjusting device 52 had insertion (interpolating) structure, demodulation control device 55 was sent to adjusting device 52 with an insertion value.Positional information determines that device 8 and information of vehicles checkout gear 9 have the similar structure with first embodiment.
As mentioned above, in the 3rd embodiment, adjusting device 52 has played and has reduced the effect that postpones wave action.Therefore, can realize decoding exactly, and reduce the error ratio of the digital signal that receives.
Digital TV broadcast receiving equipment among the 3rd embodiment as shown in Figure 6, input unit 1 can have a plurality of antennas 11, and receiving system 4 can have first to N receiving unit.Though Fig. 6 shows a frequency analysis device 51, an adjusting device 52 and a decoding device 53, the number that installs wherein at least one device of 51,52 and 53 can be corresponding with the number of antenna 11.The number of device depends on its structure.For example, be that the digital TV broadcast receiving equipment shown in convenient Fig. 6 comprises a frequency analysis device 51, this digital TV broadcast receiving equipment is usually by selector operation (not shown), with from a plurality of signals of first to N receiving unit output, selection will be by a signal of frequency analysis device 51 processing.Equally also be applied on the number of adjusting device 52 and decoding device 53.
In the digital TV broadcast receiving equipment shown in Fig. 6, each is carried out frequency analysis from the signal of input unit 1 output.Therefore, can estimate from the amplitude and the delay cycle of the delay ripple of the signal of input unit 1 output corresponding to each.Like this, the signal that receives with optimum state can be conditioned device 52 selections.
Can one by one carry out the above-mentioned adjusting operation that utilizes transfer function, filtering or insertion, thereby a plurality of signal can decoded device 53 decodings to signal.
In decoding device 53 or adjusting device 52, only select the signal of the frequency spectrum that receives down in good order and condition, and according to this signal of frequency analysis result treatment of the signal of each antenna 11.In this case, can realize the demodulation of gratifying digital code.
As mentioned above, a plurality of antennas 11 in the equipment shown in Figure 6 have reduced the reception error.
Embodiment 4
With reference to Figure 12 digital TV broadcast receiving equipment in the fourth embodiment of the present invention is described.Figure 12 is the block diagram of the digital TV broadcast receiving equipment among the 4th embodiment.
As shown in figure 12, this digital TV broadcast receiving equipment comprises: input unit 1, adder 3, receiving system 10, demodulating equipment 5, addition control device 6 and delay ripple estimating apparatus 7.
When the digital TV broadcast receiving equipment among Figure 12 was mounted on the vehicle, this equipment comprised that also positional information determines device 8 and information of vehicles checkout gear 9.Promptly this digital TV broadcast receiving equipment of box lunch is not when being mounted on the vehicle, and this digital TV broadcast receiving equipment among the 4th embodiment can comprise that also positional information determines device 8 and information of vehicles checkout gear 9.
Digital TV broadcast receiving equipment shown in Figure 12 does not comprise deferred mount 2.Be not described in detail with components identical among Fig. 4 herein.
Receiving system 10 detects from VHF, the UHF of input unit 1 transmission or the signal other frequency bands, and the signal that detects is sent to demodulating equipment 5.This receiving system 10 is the signal of demodulating equipment 5 manageable frequencies with this conversion of signals.
Below detailed description is used for the receiving system 10 of detection signal.Figure 13 has been the example structure of the receiving system 10 of detector effect.This receiving system 10 comprises: band pass filter 101, reference signal generation device 102, low pass filter part 103 and sine wave signal generation device 104.This low pass filter part 101 comprises first to N low pass filter.This reference signal generation device 102 comprises first to N reference signal generator.This low pass filter part 103 comprises first to N low pass filter.Sine wave signal generation device 104 comprises first to N sine wave signal generator.
Receiving system 10 is operated with for example following manner.
A plurality of received signals that input unit (Figure 12) obtains are through low pass filter part 101.Reference signal generation device 102 produces the sine wave signal with frequency identical with the received signal frequency.For example when the frequency of received signal was 500Mhz, the first reference signal generator of reference signal generation device 102 produces had the sine wave signal that frequency is 500Mhz.First of reference signal generation device 102 all produces a reference signal to each of N reference signal generator.
Then, the sine wave signal that obtains of signal and the reference signal generation device 102 by low pass filter part 101 multiplies each other.The signal that is produced is through being used for the low pass filter part 103 of frequency inverted.Signal after frequency inverted is from 103 outputs of low pass filter part.
The phase information that sine wave signal generation device 104 obtains according to reference signal control device 64 produces a sine wave signal.It is the signal of the low like this frequency of 0 to tens kHz that this sine wave signal generation device 104 produces each frequency.For example, primary sinusoid generator produce frequency be 0Hz (the DC signal: signal direct current signal), it is the signal of 10Hz that second sine-wave producer produces frequency, N sine-wave producer generation frequency is the signal of 15Hz.A plurality of signals that sine wave signal generation device 104 produces and a plurality of signal multiplication through low pass filter part 103.
As mentioned above, receiving system 10 can change each phase place with respect to a plurality of signals of time that obtains from input unit 1.Therefore, in digital TV broadcast receiving equipment shown in Figure 12, have 180 at input signal and spend under the situation about differing, also can avoid the input signal of receiving system 10 excessively to offset such state generation.
Figure 14 is the exemplary construction block diagram that serves as another receiving system 10 ' of detector.Receiving system 10 shown in Figure 13 needs sine wave signal generation device 104 with travel(l)ing phase, and receiving system 10 ' shown in Figure 14 utilizes reference signal generation device 102 ' travel(l)ing phase.
Receiving system 10 ' comprising: band pass filter part 101, reference signal generation device 102 ' and low pass filter part 103.This receiving system 10 ' does not comprise the sine wave signal generation device.This reference signal generation device 102 ' comprises as first to N reference signal generator in the receiving system 10.
Reference signal generation device 102 ' is regulated the frequency of the sine wave signal that is produced according to the phase information of reference signal control device 64 outputs.For example, when the frequency of received signal (TV signal) is 500MHz, the first reference signal generator of reference signal generation device 102 ' produces a sine wave signal with 500MHz frequency, the second reference signal generator of reference signal generation device 102 ' produces one and has 500,000, the sine wave signal of 010Hz frequency.That is, reference signal generation device 102 ' provides a signal different slightly with the frequency of TV signal.Therefore, receiving system 10 ' shown in Figure 14 has the same effect of receiving system shown in Figure 13 10.
In Figure 13 and reference signal generation device shown in Figure 14, the frequency of a plurality of reference signals (first to N reference signal) that first to N reference signal generator produces must equal the frequency of the signal that each reference signal generator received; Perhaps the difference between the frequency of the frequency of the signal of reference signal generator generation and the signal that each reference signal generator is received must be in the scope of a regulation.Owing to a plurality of reference signals are arranged, therefore can not always satisfy these conditions.
In this case, receiving system 10 shown in Figure 26 " be effective.
Receiving system 10 " comprise band pass filter part 101, reference signal generation device 102 ", low pass filter 103 and phase changer 105.Band pass filter part 101 and low pass filter part 103 have and (Figure 13) receiving system 10 similar structures.Phase changer 105 comprises first to N phase shift section.First to each of N phase shift section according to the control signal of coming self-generated reference signal control device 64, the phase place of control reference signal.Phase changer 105 can pass through, and for example variable impedance element is realized.First to N phase shift section can change the phase place of reference signal independently according to the control signal of coming self-generated reference signal control device 64 (that is: control voltage).
At receiving system 10 " in, reference signal generation device 102 " only produce a reference signal.Therefore, receiving system 10 " make the frequency of the signal that the phase place of reference signal is received with respect to the reference signal generator that offset slightly be arranged.
The method of the phase place of control phase changer 105 will describe in detail with the lower part.
Embodiment 5
With reference to accompanying drawing 16 and 17 digital television broadcasting receiving system in the fifth embodiment of the present invention is described.
Figure 16 illustrates the installation situation as the antenna 110 of input unit.Figure 17 is the detailed view of antenna 110.Except input unit, this digital TV broadcast receiving equipment among the 5th embodiment can have any one structure of describing among seven embodiment of first embodiment to the in the specification.
The operation of antenna 110 is described with reference to Figure 16 and 17.
As shown in figure 16, antenna 110 is installed in the end face of truck or back on glass along vehicle.In this embodiment, antenna 110 be constitute like this so that when antenna 110 receives radio waves this antenna be movably.
As shown in figure 17, antenna 110 comprises antenna element 111 and 112 and antenna strutting piece 113.Antenna element 111 and 112 coupling part and antenna strutting piece 113 be constitute like this so that antenna element 111 and 112 and antenna strutting piece 113 be transportable between relative to each other.Like this, antenna element 111 and 112 can utilize motor etc. to move on direction shown in arrow A among Figure 17 and B with remote control mode.
When receiving data in digital TV broadcast receiving equipment is moving, so that constantly moved, the transmission path characteristic of transmission antenna (that is: the antenna in broadcasting station) and reception antenna (that is: antenna 110) is state and different in time by control antenna 110.Because this system, cause when signal be when under multipath conditions, receiving, the state of interference is variation (that is: the negative area on the frequency direction).A plurality of signals added together have 180 differ and these signals are eliminated to each other during when addition situation under, usually the error ratio that produces when receiving sort signal can reduce with the characteristics of signals that changes received signal by the position that changes antenna element 111 and 112.In this embodiment, antenna element 111 and 112 benefits of arranging like this are: in this case, when digital TV broadcast receiving equipment moved with low speed or stops, received signal was eliminated to each other mutually at some cycles or in the longer time.Antenna 110 movably scope can be, for example 1/4 wavelength of the transmission signal of the TV signal that will receive.
In addition, antenna element 111 and 112 position are fixed according to the wavelength of the signal that will receive when receive channel is determined.This position can be determined in the following manner.Antenna element 111 and 112 position can be moved in 1/4 wave-length coverage of wanting received TV signal.From the signal plus of antenna element 111 and 112 outputs to together.When the receiving feature that has been improved, fixed characteristic element 111 and 112 position.By such layout, avoided opposite to a great extent from phase place between the signal of antenna element 111 and 112 outputs.Also very likely make multipath disturb the negative area that causes, have different recessed positions to each other.
When the position of antenna 110 changes according to the frequency of received signal, improved receiving feature.In the above-described embodiments, antenna 110 is movably.In addition, two antenna elements 111 and 112 can combine each other at the place, fixed position.In this case, can obtain identical effect.
Embodiment 6
With reference to Figure 18 A, 18B, 18C and 18D digital TV broadcast receiving equipment in the sixth embodiment of the present invention is described.Figure 18 A, 18B, 18C and 18D are the instance graphs of digital TV broadcast receiving equipment among the 6th embodiment.Each of Figure 18 A, 18B, 18C and 18D has all provided another kind of distortion, with single quotation marks (') and double quotation marks (") element represented corresponding to the same numeral that does not have quotation marks of element of expression.
Shown in Figure 18 A, the digital TV broadcast receiving equipment among the 6th embodiment comprises: input unit 1, adder 3, receiving system 4, demodulating equipment 5, delay ripple estimating apparatus 7, amplifying device 12, phase changer 13 and addition control device 600.Addition control device 600 comprises gain control 61 and phase shift control device 63.This amplifying device 12 comprises first to N amplifier section.This phase changer 13 comprises first to N phase shift section.
In the 6th embodiment, when digital TV broadcast receiving equipment was installed on the vehicle, this equipment comprised that also positional information determines device 8 and information of vehicles checkout gear 9.This information of vehicles checkout gear 9 comprises speed detector 91 and position detecting device 92.Even if be not installed on the vehicle, this digital TV broadcast receiving equipment also can comprise information of vehicles checkout gear 9.
Digital TV broadcast receiving equipment shown in each of Figure 18 A, 18B, 18C and 18D comprises: replaced the amplifying device 12 and the phase changer 13 of the deferred mount 2 among Fig. 2 and replaced the addition control device 600 of the addition control device 6 among Fig. 2.
The operation of the digital TV broadcast receiving equipment among the 6th embodiment is described with reference to Figure 18 A here.
The radio wave of television broadcasting is converted into a plurality of signals of telecommunication by the reception antenna 11 of input unit 1, is sent to amplifying device 12 then.The control information that this amplifying device 12 obtains according to gain control 61, the gain of amplifying each signal that obtains from input unit 1.Phase changer 13 moves from the phase place of each signal of amplifying device 12 transmission according to the phase control signal that obtains from phase control device 63.Adder 3 will be from the signal plus of phase changer 13 estimations.This receiving system 4 extracts the component of required frequency band from adder 3 added signal, and the component that extracts is sent to demodulating equipment 5.This demodulating equipment 5 will be from the component demodulation of receiving system 4, and the numerical data that generates of output.This demodulating equipment 5 is also to postponing the relevant information that is included in from the delay ripple in the received signal of receiving system 4 of ripple estimating apparatus 7 outputs.Postpone ripple estimating apparatus 7 and utilize the information that obtains from demodulating equipment 5, output is included in the delay ripple information in the received signal.
Addition control device 600 utilizes from postponing ripple estimating apparatus 7 and positional information determines the information that at least one device the device 8 obtains, and obtains the control signal of control amplifying device 12 and the control signal of control phase changer 13.Input unit 1, adder 3, receiving system 4, demodulating equipment 5, delay ripple estimating apparatus 7, positional information determine that the operation of device 8, information of vehicles checkout gear 9 and amplifying device 12 is identical with the description among the embodiment of front, no longer repeat here.
Hereinafter will describe the operation of addition control device 600 in detail.As mentioned above, addition control device 600 comprises gain control 61 and phase control device 63.
Gain control 600 inputs are about coming self-dalay ripple estimating apparatus 7 and positional information to determine the information of the received signal of at least one device in the device 8.This gain control 61 determines for example whether received signal comprises delay wave component (interference components).When determine to exist postponing ripple, gain control 61 obtains about the motion state of the object that postpones intensity of wave, the delay cycle that postpones ripple and phase place and moving and receives the information of disturbance state in the past.When received signal was subjected to postponing the interference of ripple, gain control 61 was mainly used in the information that ride gain is provided for amplifying device 12, thereby improved the characteristic of received signal.For example, when received signal obviously is interfered, gain control 61 can give a plurality of input signals each a gain all is provided.When received signal is not when being interfered significantly, gain control 61 can be given one in the input signal provide a gain, and selects this signal.Consequently, as described in first embodiment, the frequency characteristic of carrying out the signal of selective attenuation through overfrequency can be enhanced.Be the level of convenient input signal when insufficient, amplifying device 12 also can amplify this signal level.
Next, the operation of phase control device 63 is described.Phase control device 63 utilizes from postponing ripple estimating apparatus 7 and positional information determines the information that at least one device obtains the device 8, determines the phase-shift phase of each signal of given amplifying device 12.This phase changer 13 moves a plurality of phase of input signals according to the control signal that obtains from phase control device 63.Because a plurality of signals of handling through phase shift through phase changer 13 are added to together in adder 3, therefore the system that is added in amplifying device 12 with signal compares, and has reduced to have the signal plus that 180 degree differ and makes the possibility of eliminating each other.
Hereinafter detailed description is positioned at the operation of device 13.Figure 19 is the example structure block diagram of phase changer 13.
As shown in figure 19, phase changer 13 comprises: importation 131, phase-shift circuit 132, not circuit 133 and 134, mlultiplying circuit 135,136,137 and 138 and add circuit 139.Not circuit 133 and 134 is with the signals reverse that is received.This mlultiplying circuit 135,136,137 and 138 suitably amplifies the signal that is received.
The signal that importation 131 is received is sent to phase-shift circuit 132, not circuit 133 and mlultiplying circuit 136.The signal feeding that is sent to phase-shift circuit 132 has the delay of a phase place, for example 90 ℃.Be sent to add circuit 139 from one of them signal of phase-shift circuit 132 outputs through not circuit 134 and mlultiplying circuit 137.Other signals from phase-shift circuit 132 outputs are sent to add circuit 139 through mlultiplying circuit 138.
The signal that is sent to not circuit 133 is reverse by not circuit 133, and is sent to add circuit 139 through mlultiplying circuit 135.This signal that is sent to mlultiplying circuit 136 is exaggerated circuit 136 and amplifies, and is sent to add circuit 139.This add circuit 139 receives and this signal of addition.
Its result with respect to the signal that is input to phase-shift circuit 132, has one from the 0 arbitrary phases skew of spending to 360 degree from the signal of add circuit 139 output.Given mlultiplying circuit 135,136,137 and 138 yield value be state and changing in time, to change from add circuit 139 state and the phase place of the signal exported in time.
Phase-shift circuit 132 can be realized by voltage control one variable impedance element.Figure 24 is applied to the voltage of variable impedance element and according to the relation curve between the phase-shift phase of this change in voltage.According to as shown in figure 24 0V voltage to 1V, the variable impedance elements that can be linearly phase of input signals be changed to 360 degree from 0 degree can use the phase changer shown in Figure 18 A, 18B, 18C and the 18D 13 first in each of N phase shift section.
With reference to Figure 25 A, 25B and 25C a kind of embodiment that changes the method for phase time direction is described.Figure 25 A, 25B and 25C illustrate the voltage that is applied on the phase shift section and the relation between the time.When for example phase-shift circuit 132 (Figure 19) comprised that first, second and third phase move part, the signal shown in Figure 25 A was input to first phase shift section, and the signal shown in Figure 25 B is input to second phase shift section, and the signal shown in Figure 25 C is input to third phase and moves part.The phase place of each signal changes independently.In the above description, phase place changes to 360 degree from 0 degree, will phase change not surpass 360 degree.
Phase-shift circuit 132 (Figure 19) can also be by changing the signal path lengths described in above-mentioned first embodiment or utilizing the SAW element to realize.
Because said structure, thus can be according to the control signal that obtains from phase shift control device 63, control each phase place of a plurality of signals.Since this system provide with previous embodiment in the identical effect of deferred mount described, so when reverse signal is added together, can prevents to have 180 signals that differ and eliminate each other.With a plurality of added together simply comparing of signal from the antenna input, the interference of received signal reduces significantly.
In the structure shown in Figure 18 A, input unit 1 signal handle by amplifying device 12 and phase changer 13, then through adder 3 additions, carry out frequency inverted by receiving system 4 again.
In this embodiment, shown in Figure 18 B, comprise that first receiving system 4 ' to N receiving unit can be positioned to be right after after amplifying device 12 that phase changer 13 can be positioned at and be right after at receiving system 4 ' afterwards.In this structure of Figure 18 B, the addition of the phase shifts of phase changer 13 and adder 3 all is to finish in the frequency band of baseband signal.
Shown in Figure 18 C, use receiving system 4 " replacement receiving system 4.In the structure shown in Figure 18 C, the signal that input unit 1 receives amplifies through amplifying device 12, and is converted into the signal (that is: intermediate-freuqncy signal) in the frequency band between signal frequency and baseband signal frequency band.Thereafter, this intermediate-freuqncy signal is received device 4 " be converted to the signal (that is: baseband signal) of the frequency that can be handled by demodulating equipment 5.
In the structure shown in Figure 18 C, phase changer 13 is positioned at and is right after at receiving system 4 " afterwards.Therefore, the frequency band of the signal that be handled by phase changer 13 is lower than the frequency band in Figure 18 A structure.When signal is received device 4 " when being converted to intermediate frequency, this signal can be converted into the signal in the constant frequency band.In this case, even if when expecting the signal of different channels, also do not need frequency, change phase changer 13 employed phase shift control methods according to desired channel.
Can use the structure that changes the received signal characteristic in the midband to replace the deferred mount of describing among first to fourth embodiment.This structure of the 6th embodiment has identical effect.
In the structure shown in Figure 18 A, 18B, the 18C, amplifying device 12 is positioned at and then input unit 1 position afterwards, and the gain of each signal is subjected to the control from the control signal of gain control 61 like this.In addition, shown in Figure 18 D, can Be Controlled from the gain of the signal of phase changer 12 output.
Can reduced graph 18A, 18B and the structure of 18C by deletion gain control 61.In this case, signal is exaggerated a constant level.
Embodiment 7
With reference to accompanying drawing 20 digital TV broadcast receiving equipment in the seventh embodiment of the present invention is described.Figure 20 is the structured flowchart of digital TV broadcast receiving equipment among the 7th embodiment.
As shown in figure 20, the digital TV broadcast receiving equipment among the 7th embodiment comprises: input unit 1, deferred mount 2, adder 3, receiving system 4, demodulating equipment 5, addition control device 6 and accepting state estimating apparatus 14.Addition control device 6 comprises gain control 61 and delay cycle control device 62.This deferred mount 2 comprises first to N decay part.This adder 3 comprises first to N gain-adjusted part 31.
In the 7th embodiment, when digital TV broadcast receiving equipment was installed on the vehicle, this equipment also comprised information of vehicles checkout gear 9.This information of vehicles checkout gear 9 comprises speed detector 91.Even if be not installed on the vehicle, this digital TV broadcast receiving equipment also can comprise information of vehicles checkout gear 9.
Digital TV broadcast receiving equipment among Figure 20 comprises: accepting state estimating apparatus 14 is with the delay ripple estimating apparatus 7 shown in the alternate figures 2.This information of vehicles checkout gear 9 has one and is different from structure shown in Figure 2.Adder 3 comprises first to N gain-adjusted part 31.
The operation of apparatus of digital television receiving of the present invention among the 7th embodiment is described with reference to Figure 20 with the lower part.
The radio wave of television broadcasting is converted to a plurality of signals of telecommunication by the reception antenna 11 in the input unit 1 for example, and is transferred to deferred mount 2.This deferred mount 2 is according to the control signal that obtains from delay cycle control device 62, and output has the signal of delay.This signal with delay is transferred to adder 3.This adder 3 is according to gain control 61, regulates the addition ratio of a plurality of signals that obtain from deferred mount 2.Then, adder 3 is with a plurality of signal plus.Receiving system 4 extracts the component of required frequency band from adder 3 added signal, and the component that is extracted is transferred to demodulating equipment 5.These demodulating equipment 5 demodulation are from the component of receiving system 4, and the numerical data of output generation.
Demodulating equipment 5 will output to accepting state estimating apparatus 14 about the information of demodulation state so that accepting state estimating apparatus 14 estimation these accepting states (radio state).This demodulating equipment 5 is according to the information of relevant input state, and for example the level from the signal of input unit 1 output changes, and/or according to the information of the relevant demodulation state that is obtained by demodulating equipment 5, determines accepting state.
As mentioned above, addition control device 6 comprises: gain control 61 and delay cycle control device 62.This gain control 61 utilizes the information that at least one device obtains from accepting state estimating apparatus 14 and information of vehicles checkout gear 9, to the 31 output gain control informations of gain-adjusted part.Delay cycle control device 62 utilizes the information that at least one device obtains from accepting state estimating apparatus 14 and information of vehicles checkout gear 9, to deferred mount 2 output delay cycle control informations.The operation of input unit 1, deferred mount 2, receiving system 4, demodulating equipment 5, addition control device 6 and speed detector 91 is identical with the embodiment of foregoing description, no longer repeats here.
Hereinafter will describe the operation of accepting state estimating apparatus 14 in detail.Accepting state estimating apparatus 14 obtains the such information of transmission characteristic that is for example obtained received signal by demodulating equipment 5, and whether definite received signal comprises the reception interference signal as postponing ripple.When determining to have interference signal in received signal, 14 pairs of multipath disturbance states of this accepting state estimating apparatus are estimated, and comprise at least a kind of in signal level, the delay cycle that postpones ripple and the phase place estimated.Accepting state estimating apparatus 14 also obtains the information of the margin of error in the relevant demodulating data.To received signal the estimating and measuring method of transmission characteristic is described in the aforementioned embodiment, no longer repeats here.Accepting state estimating apparatus 14 obtains the information of the signal level that relevant input unit 1 receives, and obtains for example passing by the such data of accepting state of each antenna 11 in a year.Then, accepting state estimating apparatus 14 utilizes the information that obtains from input unit 1 and demodulating equipment 5 that current accepting state is estimated, and the current accepting state that will estimate is transferred to addition control device 6.This accepting state estimating apparatus 14 also obtains the information of modulating mode of the transmission parameter of relevant received signal when needed.
Hereinafter will describe the operation of the gain control 61 that comprises in the addition control device 6 in detail.Gain control 61 is according to the accepting state of accepting state estimating apparatus 14 estimations, the control information of obtaining the gain-adjusted part 31 that is included in the adder 3.Described in first embodiment, when accepting state is satisfactory, only use relevant input signal just can obtain enough characteristics.Therefore, gain control 61 provides a control signal to adder 3, gain is applied on the input signal and other input signals of decaying.Use this system, the data of selecting an antenna to receive, and utilize an antenna to generate the reception accepting state that data realized.When signal level reduction or multipath interference increase, gain control 61 is exported a control signal so that gain is applied on a plurality of input signals to adder 3.
In this, gain control 61 applies different yield values to control signal of adder 3 output to give all suitable input signals, is effective thereby reduce relevant between the input signal.Gain control 61 must indicate adder 3 to avoid change in gain rapidly.Its reason is, because the signal of OFDM modulation comprises the control signal that demodulation is used, antenna switching rapidly might cause the data of accumulation in a year in the past invalid.
Gain control 61 can be simplified, thereby a fixing yield value can be imposed on signal.
In the 6th embodiment, the also direct phase place of control signal, and replace above-mentioned control delay cycle.Its effect is identical.
The operation of delay cycle control device 62 hereinafter will be described.Delay cycle control device 62 is determined the retardation of deferred mount 2 given each input signal according to accepting state and other information that accepting state estimating apparatus 14 obtains.Here, the method for control lag amount will be described in when changing each phase place of signal along with the time under the situation with a plurality of signal plus for example.Deferred mount 2 given retardations are subjected to the control of the method described among first to the 4th embodiment.
Hereinafter will describe when input signal being added on a plurality of antennas, the mobile status of digital TV broadcast receiving equipment is how to get in touch with the reception plane of digital television signal.
Digital television broadcasting relates to the multiple technology that prevents that multipath from disturbing.Therefore, compare with traditional analog television broadcast, digital television broadcasting relatively is not easy to be interfered, and is irrelevant with the mobile status of digital TV broadcast receiving equipment.
Above-mentionedly prevent that the measurement of disturbing from comprising: (1) adopts the OFDM modulating mode; (2) between the significant character that is preventing to postpone the intersymbol interference that ripple causes, provide a protection gap periods; (3) on time and frequency direction, rearrange the data flow that will transmit, thereby make the data error in the received signal disperse, utilize error correcting code to improve the generation of error correcting capability with the reception mistake of the pattern of avoiding happening suddenly.
With reference to Figure 28 to 30 significant character, significant character cycle and protection gap periods are described.
Figure 28 has shown the structure of an ofdm signal, and Figure 29 has shown the structure of anolog TV signals.
This ofdm signal comprises a plurality of carrier waves.When being transmitted, block of information A is transmitted simultaneously to G when for example information " A, B, C, D... ", and block of information H is transmitted simultaneously to N then, as shown in figure 28.Block of information A is called a significant character cycle to the cycle that G is transmitted.A significant character cycle is depended on the interval of the intercarrier of ofdm signal.When for example intercarrier be 4kHz at interval the time, a significant character cycle is 1/4000=250 * 10 -6Second.Block of information A or G are called a significant character.
Ofdm signal also comprises the protection gap periods except significant character the cycle, with transmission block of information A.Figure 30 shows a significant character cycle and a protection gap periods.For example, block of information A was transmitted during the significant character cycle.Yet, comprise the undesirable disturbing wave of people among the block of information A, and block of information A influences the direct wave of block of information H.For fear of these, the guiding of each block of information (lead) part all has the information of the ending about same block (rear) part that writes.This leader is called the protection gap periods.In addition, the ending of each block of information has the information about the leader of same block that writes.
Yet, can predict: additionally low or receive to disturb and for example to use the high level of interference ripple to carry out frequency to decay selectively when producing, can produce Data Receiving error above error correcting capability when incoming signal level.For fear of these, can be by will be from the input signal addition of a plurality of antennas 11 and the level of rising input signal, and reduce frequency and decay selectively and reduce error effectively.
When digital TV broadcast receiving equipment moved, the signal receiving feature of a plurality of antennas 11 constantly changed.Promptly to together, in a segment length time cycle, signal can not have 180 differ to box lunch to each other yet from the signal plus of a plurality of antennas.
Yet when digital TV broadcast receiving equipment stopped or moving with low speed, the signal receiving feature of a plurality of antennas 11 was not to change significantly.In the time cycle that one prolongs, might produce and have 180 signals that differ and be added to the situation that a time-out is eliminated each other.For fear of these, digital TV broadcast receiving equipment changes one of them individual delay cycle of a plurality of input signals in time.By this way, the phase place of each of a plurality of input signals changes in time toward each other.This is subjected to the situation of Doppler (Doppler) effect corresponding to the electromagnetic wave that each antenna received.
As mentioned above, when mobile object is mobile,, therefore need the phase place of control signal hardly because the receiving feature of signal changes consistently.
The operation of delay cycle control device 62 hereinafter will be described under the situation of the mobile status of having considered digital TV broadcast receiving equipment.
Figure 21 is the operational flowchart of delay cycle control device 62.
At step S1, delay cycle control device 62 obtains receiving status information from accepting state estimating apparatus 14.At step S2, delay cycle control device 62 is determined the quantities received that multipath disturbs according to receiving status information.When delay cycle control device 62 determined that multipaths disturb reference quantity greater than step S2, delay cycle control device 62 obtained the translational speed information at step S3 from speed detector 91.At step S4, delay cycle control device 62 is determined the translational speed of mobile object according to translational speed information.When step S4 delay cycle control device 62 definite mobile objects are in low-speed motion or stop, delay cycle control device 62 obtains the broadcast mode information at step S5 from accepting state estimating apparatus 14.In this manual, " low speed " relates to the vehicle that digital TV broadcast receiving equipment has been installed in the present embodiment and moves the Doppler frequency that is produced and become speed when for example 0Hz is to 10Hz.At step S6, delay cycle control device 62 obtains the optimum value of the controlled quentity controlled variable of delay cycle with reference to the table that concerns between an expression delay cycle controlled quentity controlled variable and the broadcast mode.At step S7, the 62 output delay cycle control informations of delay cycle control device.
Determining at step S2 that multipath disturbs when delay cycle control device 62 is not more than reference quantity or determines that at step S4 mobile object is not with low-speed motion or when stopping, delay cycle control device 62 is used to prevent the delay cycle control information of delay cycle control in step S8 output.Then, end operation.
Below will be described in the table about the controlled quentity controlled variable of delay cycle of reference among the step S6 briefly.When the control delay cycle when changing the phase place of signal time direction, the variation in the phase place brings the interference of intercarrier to ofdm modulation signal.For fear of this problem, delay cycle control device 62 need be provided with the upper limit of phase-shift phase.The upper limit of phase-shift phase can be set to intercarrier for example the interval 1% or littler.Owing to the influence of the interference of intercarrier along with modulating mode or transmission parameter (that is: the time interval) change, so, the upper limit of phase-shift phase or phase-shift phase is set effectively for each carrier modulation modes or each transmission parameter.For example: delay cycle can followingly be controlled: when the intercarrier of ofdm modulation signal be 2kHz and carrier modulation modes when being the DQPSK modulating mode at interval, the upper limit of phase-shift phase is set to 1% of carrier spacing, that is: 20Hz; When data were modulated by the 16QAM modulating mode, phase-shift phase was set to 0.5% of carrier spacing, that is: 10Hz.
In the 6th embodiment, the direct phase place of control signal and replace above-mentioned control delay cycle.It has identical effect.Figure 22 illustrates when the phase place of direct control signal, the structure of the digital television broadcasting television equipment of use.In structure shown in Figure 22, use phase changer 13 replaces the deferred mount 2 among Figure 20.The delay cycle control device 62 that uses phase control device 63 to replace among Figure 20.That describes among the operation of phase changer 13 and phase control device 63 and the 6th embodiment is identical, is not repeating here.
With reference to Figure 23 A and 23B, describe when a plurality of input signals and be added to together and its each phase place position and when changing in time the reception error generation state of generation.The reception error that Figure 23 A takes place when illustrating under having the environment that strong relatively reception disturbs by antenna receiving signal generates state; Figure 23 B illustrates when the reception error that takes place during by a plurality of antenna receiving signal under equivalent environment and generates state.In Figure 23 A and 23B, the trunnion axis express time, vertical axis is represented margin of error.
Can see from Figure 23 A and 23B: when by a plurality of antenna receiving signal, the error number reduces, and the time stamp of error when producing disperseed on time shaft.Like this, when its each phase place is controlled, can the error generation appear receiving in a short time continuously by a plurality of input signals being added to be controlled at together and strictly.
Because receiving system in this embodiment can prevent that occurring receiving error in a short time continuously produces, and reduces the number of data error, so can shorten the time interval length that needs when transmitting signal.Its reason is: because this system in the present embodiment can prevent the continuous generation of error, so even if the time interval is short, data error also can be disperseed on time shaft.The length in the time interval that needs when shorten transmitting signal can reduce reception valuably and need be stored data volume with the data of the data flow that is used for recovering digital TV broadcast receiving equipment.
As mentioned above, digital TV broadcast receiving equipment in the 7th embodiment, by the information of acquisition accepting state and translational speed, and in according to its each phase place of the information Control that is obtained and gain, a plurality of input signals are added to together, reduce receiving the generation of disturbing.And, by phase place, can strictly control and work as the appearance reception error generation continuously in a short time that a plurality of antenna input signals are added to time-out appearance along with time change signal.System does not in this embodiment resemble prior art, and it can prevent to receive the continuous generation of error, even if work as time interval length in short-term, error also can dispersed and distributed.This makes the time interval that can shorten interpolation when transmitting signal.Structure among this embodiment can with any one textural association among first to the 6th embodiment.
In first to the 7th embodiment, input unit 1 can comprise a plurality of antennas 11, and can select from the signal of input unit 1 output from the signal of a plurality of antenna 11 outputs.Even, can improve receiving efficiency by the signal of not expecting of deletion from the signal of antenna 11 outputs.
The part of the digital TV broadcast receiving equipment with a kind of like this structure is described with reference to Figure 27.Figure 27 comprises a plurality of antennas 11 and the input unit 1 of a selection part and the block diagram of an error ratio measure portion.Except input unit 1 and error ratio measure portion, this digital TV broadcast receiving equipment has the identical structure with first to the 7th embodiment.
Input unit 1 comprises: the selection part of the signal that a plurality of antennas 11 and select according to the control signal that obtains from the error ratio measure portion will be output.This error ratio measure portion is measured the error ratio of signal in the demodulating equipment.When error ratio surpassed a predetermined value, this error ratio measure portion partly provided a control signal for the selection in the input unit 1, and this control signal makes selects part to select its level to surpass the signal of a predetermined level from the signal of antenna 11 outputs.This structure shown in Figure 27 can be so that digital television broadcasting stably receives.
This selects part to select its level to surpass the signal of a predetermined level from the signal of antenna 11 outputs.In the interval of the predefine value that is equal to or greater than this received signal, carry out this selection.The predefine value of this received signal relates to the required time cycle of data of for example transmitting a frame ofdm signal.This selects each received frame that part can the selective reception signal or the signal in the arbitrary frame.
Signal for deletion from the signal of antenna 11 outputs is not expected can also use other structures.
For example, addition control device 6 can produce the control signal of the addition ratio that changes adder 3 according to from postponing the signal of ripple estimating apparatus 7 outputs.In the case, the addition ratio changes.In the signal that adder 3 is received, signal is attenuated, thereby in demodulating equipment 5, the corresponding signal level of signal that surpasses a predetermined level with the level of the signal with error ratio becomes 0.
The addition ratio changes in the interval of the predefine value that is equal to or greater than this received signal.The addition ratio can change in each received frame of received signal or arbitrary frame.
In first to the 7th embodiment; these set points, for example the phase-shift phase of the magnification ratio of the delay cycle of the addition ratio of adder, deferred mount, amplifying device and phase changer can be during the protection gap periods of received signal, be right after at significant character after the cycle or be adjacent to significant character and upgraded before the cycle.
In first to the 7th embodiment, positional information is determined device 8, obtains the information about the position of transfer station, and the information that obtains according to information of vehicles checkout gear 9 and the position of transfer station, the radio wave accepting state of estimation receiving position.Information determines that device 8 can store the radio wave state of a plurality of positions in advance, and the radio wave state of the information estimation receiving position that obtains according to information of vehicles checkout gear 9.This information determines that device 8 can at interval or arbitrarily the time interval obtains the radio wave state of a plurality of positions with preset time, upgrade the state of the radio wave of a plurality of positions, and estimate the radio wave state of receiving position according to the information that information of vehicles checkout gear 9 obtains.In addition, radio wave state can be estimated by the system of reception information data that the accepting state of a plurality of positions of expression is transmitted in broadcasting station wherein, and any one digital TV broadcast receiving equipment among first to the 7th embodiment can receive this reception information data.
The present invention can also improve the reception by the generation of the variation in the transmission characteristic that occurs and disturb except can improve the reception interference that produces when receiving equipment moves in aircraft flight.In other words, the present invention is not only applicable to fixed receiver, also is applicable to mobile receiver.
Can see that from above-mentioned explanation compared with prior art, the reception the electric field strength as multipath interference or TV signal that the present invention has occurred when having improved receiving digital television signal significantly reduces is disturbed.This improvement is to realize by the signal processing of disturbing as the addition or the reception of the delay control of received signal, a plurality of signals such as estimation.This improvement can also be by using the signal input unit of a plurality of antennas or realizing by the installation site of controlling one or more antennas.
Under the data conditions of the accepting state of the receiving position that transmits relevant digital television broadcasting from transfer station, digital TV broadcast receiving equipment of the present invention can receive disturbance state in the estimation of receiving position place, and utilizes this data minus weak jamming.
Under the situation that does not break away from the spirit and scope of the invention, it is easily to those skilled in the art that the present invention is made various improvement.Therefore, the scope of claims is not limited to the description in the above-mentioned specification, but is based upon on the basis of wider scope.

Claims (69)

1, a kind of digital TV broadcast receiving equipment comprises:
Modifier is used to receive first to N signal, and utilizes feedfoward control to make that at least the N-1 signal changes in the received signal;
Adder is used for the signal plus from modifier output;
Wherein: N be 2 or than 2 big natural number.
2, a kind of digital TV broadcast receiving equipment comprises:
Modifier is used to receive first to N signal, and makes according to external signal that at least the N-1 signal changes in the received signal;
Adder is used for the signal plus from modifier output;
Wherein: N be 2 or than 2 big natural number, and,
External signal is to produce according to the signal that adder obtains.
3, digital TV broadcast receiving equipment as claimed in claim 1, wherein said modifier are to be used to make the phase place of at least the N-1 signal to produce the phase changer that moves.
4, digital TV broadcast receiving equipment as claimed in claim 1, wherein said modifier are to be used to make at least the N-1 signal to produce postpone so that change the deferred mount of at least the N-1 signal.
5, digital TV broadcast receiving equipment as claimed in claim 2, wherein said modifier are to be used to make the phase place of at least the N-1 signal to produce the phase changer that moves of a regulation numerical value.
6, digital TV broadcast receiving equipment as claimed in claim 2, wherein said modifier are to be used to make one cycle stipulated time of at least the N-1 signal delay so that change the deferred mount of at least the N-1 signal.
7, digital TV broadcast receiving equipment as claimed in claim 6 also comprises:
Input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and a plurality of signals of telecommunication are exported as first to N signal;
Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion;
Demodulating equipment, being used for the conversion of signals after the frequency inverted is baseband signal;
Wherein:
Described deferred mount allows the delay cycle of described regulation at random to be provided with, and
Described adder allows addition at random to be provided with from the addition ratio of the signal of deferred mount output.
8, digital TV broadcast receiving equipment as claimed in claim 6 also comprises:
Input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication;
Amplifying device is used for amplifying a plurality of signals of telecommunication with the magnification ratio of a regulation, and amplifying signal is exported as first to N signal;
Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion;
Demodulating equipment is used for the signal demodulation after the frequency inverted;
Postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With
The addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the magnification ratio of one of them described regulation and the delay cycle of regulation, and to one of them amplifying device and the magnification ratio of described one of them the described regulation of deferred mount output and the delay cycle of regulation.
9, digital TV broadcast receiving equipment as claimed in claim 6 also comprises:
Input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication;
Receiving system is used for a plurality of signals of telecommunication are carried out frequency inverted, and the signal after a plurality of frequency inverted is exported as first to N signal;
Demodulating equipment is used for the adder added signal is converted to baseband signal;
Wherein:
Described deferred mount allows the delay cycle of described regulation at random to be provided with, and
Described adder allows addition at random to be provided with from the addition ratio of the signal of deferred mount output.
10, digital TV broadcast receiving equipment as claimed in claim 5 also comprises:
Input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and a plurality of signals of telecommunication are exported as first to N signal;
Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion;
Demodulating equipment, being used for the conversion of signals after the frequency inverted is baseband signal;
Wherein:
Described phase changer allows described regulation numerical value at random to be provided with, and
Described adder allows addition at random to be provided with from the addition ratio of the signal of phase changer output.
11, digital TV broadcast receiving equipment as claimed in claim 5 also comprises:
Input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication;
Amplifying device is used for amplifying a plurality of signals of telecommunication with the magnification ratio of a regulation, and amplifying signal is exported as first to N signal;
Receiving system is used for the adder added signal is carried out frequency inverted, and the signal after the output frequency conversion;
Demodulating equipment is used for the signal demodulation after the frequency inverted;
Postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With
The addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the magnification ratio and the regulation numerical value of one of them described regulation, and export the magnification ratio of described one of them described regulation and stipulate numerical value to one of them amplifying device and phase changer.
12, digital TV broadcast receiving equipment as claimed in claim 5 also comprises:
Input unit is used for electromagnetic wave is converted to a plurality of signals of telecommunication, and exports a plurality of signals of telecommunication;
Receiving system is used for a plurality of signals of telecommunication are carried out frequency inverted, and the signal after a plurality of frequency inverted is exported as first to N signal;
Demodulating equipment is used for the adder added signal is converted to baseband signal;
Wherein:
Described phase changer allows described regulation numerical value at random to be provided with, and
Described adder allows addition at random to be provided with from the addition ratio of the signal of phase changer output.
13, as claim 7 or 9 described digital TV broadcast receiving equipments, also comprise:
Postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With
The addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the addition ratio of one of them described regulation and the delay cycle of regulation, and to one of them adder and the addition ratio of described one of them the described regulation of deferred mount output and the delay cycle of regulation.
14, as claim 10 or 12 described digital TV broadcast receiving equipments, also comprise:
Postpone the ripple estimating apparatus, be used to receive the signal of the expression demodulation state that obtains by demodulating equipment, and according to demodulation state, estimation is included in the delay ripple information in the electromagnetic wave that input unit receives; With
The addition control device, be used for according to postponing the delay ripple information that the ripple estimating apparatus obtains, produce the addition ratio and the regulation numerical value of one of them described regulation, and export the addition ratio of described one of them described regulation and stipulate numerical value to one of them adder and phase changer.
15, as claim 8,11,13 or 14 described digital TV broadcast receiving equipments, wherein said delay ripple estimating apparatus receives the signal of the expression demodulation state that obtains by demodulating equipment, and estimation comprise postpone intensity of wave, postpone differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave.
16, as claim 8 or 13 described digital TV broadcast receiving equipments, wherein the addition control device comprises the delay cycle control device with variable impedance element, and is applied to the delay cycle that voltage on the variable impedance element is controlled described regulation by variation.
17, as claim 11 or 14 described apparatus of digital television receiving, wherein the addition control device comprises the phase control device with variable impedance element, and controls described regulation numerical value by the voltage that variation is applied on the variable impedance element.
18, as claim 8 or 13 described apparatus of digital television receiving, also comprise:
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for determining the state of the radio wave at receiving position place according to signal from position detecting device,
Wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio of one of them regulation and the time expand of regulation.
19, as claim 11 or 14 described apparatus of digital television receiving, also comprise:
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for determining the state of the radio wave at receiving position place according to signal from position detecting device,
Wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio and the regulation numerical value of one of them regulation.
20, as claim 8 or 13 described apparatus of digital television receiving, also comprise:
Speed detector is used to detect the translational speed of digital TV broadcast receiving equipment;
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for determining the state of the radio wave at receiving position place according to from the signal of position detecting device with from the signal of speed detector,
Wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio of one of them regulation and the delay cycle of regulation.
21, as claim 11 or 14 described apparatus of digital television receiving, also comprise:
Speed detector is used to detect the translational speed of digital TV broadcast receiving equipment;
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for determining the state of the radio wave at receiving position place according to from the signal of position detecting device with from the signal of speed detector,
Wherein, the addition control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces the magnification ratio and the regulation numerical value of one of them regulation.
22, as any described digital TV broadcast receiving equipment of claim in the claim 18 to 21, wherein speed detector and position detecting device are navigation system.
23, as claim 8 or 11 described digital TV broadcast receiving equipments, the reduction of signal gain when wherein amplifying device has remedied signal distributions.
24, as any described digital TV broadcast receiving equipment of claim in the claim 7 to 23, wherein input unit comprises a plurality of antennas with different receiving features.
25, a kind of digital TV broadcast receiving equipment comprises:
Input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication;
Receiving system is used for a plurality of signals of telecommunication that input unit obtains are carried out frequency inverted;
Demodulating equipment, being used for the conversion of signals after a plurality of frequency inverted is baseband signal;
Postpone the ripple estimating apparatus, be used to receive the information of the demodulation state that relevant demodulating equipment obtains, and estimation is included in the delay ripple information in the electromagnetic wave; With
The demodulation control device is used for producing a control signal according to postponing ripple information, and this control signal is used to control the transfer function that demodulating equipment is handled.
26, a kind of digital TV broadcast receiving equipment as claimed in claim 25, wherein:
Demodulating equipment comprises:
The frequency analysis device is used for a plurality of signals that obtain by receiving system are carried out frequency inverted;
Adjusting device is used for a plurality of signals that obtain by the frequency analysis device are operated;
Decoding device is used for a plurality of signals that obtain by adjusting device are decoded;
Postpone the ripple estimating apparatus, according to the information about demodulation state that obtains by decoding device, estimation comprises and postpones intensity of wave, postpones differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave;
The demodulation control device produces control signal according to postponing ripple information, with the transfer function of regulating and controlling device, and this control signal is offered adjusting device.
27, a kind of digital TV broadcast receiving equipment as claimed in claim 25, wherein:
Demodulating equipment comprises:
The frequency analysis device is used for a plurality of signals that obtain by receiving system are carried out frequency inverted;
Adjusting device is used for a plurality of signals that obtain by the frequency analysis device are operated;
Decoding device is used for a plurality of signals that obtain by adjusting device are decoded;
Postpone the ripple estimating apparatus, according to obtain by decoding device about the information of demodulation state and the signal that obtains from the frequency analysis device, estimation comprises and postpones intensity of wave, postpones differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave;
The demodulation control device produces control signal according to postponing ripple information, with the transfer function of regulating and controlling device, and this control signal is offered adjusting device.
28, apparatus of digital television receiving as claimed in claim 25 also comprises:
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for determining the state of the radio wave at receiving position place according to signal from position detecting device,
Wherein, the demodulation control device is determined the radio wave state that device obtains according to delay ripple information and positional information that delay ripple estimating apparatus obtains, produces a control signal, and this control signal is offered adjusting device.
29, as any described apparatus of digital television receiving of claim in the claim 25 to 27, also comprise:
Speed detector is used to detect the translational speed of digital TV broadcast receiving equipment;
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for the receiving position according to translational speed that is detected and detection, determines the state of the radio wave at receiving position place,
Wherein, the demodulation control device is according to by postponing delay ripple information that the ripple estimating apparatus obtains and determining the signal that radio wave state that device obtains and frequency analysis device obtain by positional information, produce a control signal, and this control signal is offered adjusting device.
30, digital TV broadcast receiving equipment as claimed in claim 29, wherein speed detector and position detecting device are navigation system.
31, as any described digital TV broadcast receiving equipment of claim in the claim 25 to 30, wherein input unit comprises a plurality of antennas with different receiving features.
32, a kind of digital TV broadcast receiving equipment comprises:
Input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication;
Receiving system is used for a plurality of signals of telecommunication that obtain by input unit are carried out frequency inverted;
Adder, a plurality of signals that are used for obtaining by receiving system carry out addition;
Demodulating equipment, the signal that is used for obtaining by adder carries out demodulation;
Postpone the ripple estimating apparatus, be used to receive the signal of the demodulation state that expression obtains by receiving system, and estimation is included in the delay ripple information in the electromagnetic wave; With
The addition control device is used for according to postponing ripple information, control adder and receiving system;
Wherein:
Described receiving system, according to the information that obtains by the addition control device, the frequency shift amount during the control frequency conversion;
Adder, according to the information that obtains by the addition control device, the addition ratio of a plurality of signals that the control addition obtains by receiving system.
33, digital TV broadcast receiving equipment as claimed in claim 32, wherein said addition control device comprises:
Gain control according to postponing ripple information, is determined the addition ratio;
The reference signal control device, each that is used for a plurality of signals is provided with the frequency of reference signal, and this frequency is being used when ripple information is carried out frequency inverted by receiving system according to postponing.
34, as claim 32 or 33 described apparatus of digital television receiving, wherein postpone the ripple estimating apparatus and receive the signal of the demodulation state that expression obtains by demodulating equipment, and estimation comprise postpone intensity of wave, postpone differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave.
35, as any described apparatus of digital television receiving of claim in the claim 32 to 34, also comprise:
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for according to the receiving position that is detected, and determines the state of the radio wave at receiving position place;
Wherein the addition control device according to postponing ripple information and radio wave state, is controlled adder and receiving system.
36, as any described apparatus of digital television receiving of claim in the claim 32 to 34, also comprise:
Speed detector is used to detect the translational speed of digital TV broadcast receiving equipment;
Position detecting device is used to detect the receiving position of digital TV broadcast receiving equipment;
Positional information is determined device, is used for determining the state of the radio wave at receiving position place according to translational speed that is detected and the receiving position that is detected,
Wherein the addition control device according to postponing ripple information and radio wave state, is controlled adder and receiving system.
37, digital TV broadcast receiving equipment as claimed in claim 36, wherein speed detector and position detecting device are navigation system.
38, as any described digital TV broadcast receiving equipment of claim in the claim 32 to 37, wherein input unit comprises a plurality of antennas with different receiving features.
39, as any described digital TV broadcast receiving equipment of claim in the claim 8,11,13,14,15,25,26,27,32 and 34, wherein demodulation state is represented by the pilot signal that is included in the electromagnetic wave.
40, as any described digital TV broadcast receiving equipment of claim in the claim 18,19,20,21,28,29,35 and 36, wherein positional information determines that device obtains the position of transfer station, and according to the position of information that obtains by the information of vehicles checkout gear and transfer station, the state of the radio wave at estimation receiving position place.
41, as any described digital TV broadcast receiving equipment of claim in the claim 18,19,20,21,28,29,35 and 36, wherein positional information is determined the device state of the radio wave of a plurality of positions of storage in advance, and according to the information that obtains by the information of vehicles checkout gear, the radio wave state at estimation receiving position place.
42, as any described digital TV broadcast receiving equipment of claim in the claim 18,19,20,21,28,29,35 and 36, wherein positional information determines that device with the interval of regulation or arbitrarily at interval, obtain the radio wave state of a plurality of positions, upgrade the radio wave state of a plurality of positions, and according to the information that obtains by the information of vehicles checkout gear, the radio wave state at estimation receiving position place.
43, a kind of transmission and receiving system, wherein the reception information data of the accepting state of a plurality of positions of expression is transmitted in the broadcasting station, digital TV broadcast receiving equipment as claimed in claim 42 receives the reception information data that transmit in described broadcasting station, thus the estimation radio wave state.
44, as any described digital TV broadcast receiving equipment of claim in the claim 18,19,20,21,28,29,35,36,40,41 and 42, wherein positional information determines that device with the interval of regulation or arbitrarily at interval, obtain the radio wave state of a plurality of positions, and determine information that device obtains and in the accepting state of a plurality of positions, the radio wave state at estimation receiving position place according to the information that obtains by the information of vehicles checkout gear or by positional information.
45, as any described digital TV broadcast receiving equipment of claim in the claim 7 to 44, also comprise: the error ratio measure portion, be used to measure signal errors ratio at the demodulating equipment place, wherein when error ratio surpasses the setting in cycle stipulated time, the error ratio measure portion produces a control signal
Wherein, input unit comprises that one selects part, is used for according to selecting an output signal from the control signal of error ratio measure portion.
46, as any described digital TV broadcast receiving equipment of claim in the claim 8,11,13,14,16 to 21,32,33,35 and 36, wherein the addition control device is according to the signal that postpones the output of ripple estimating apparatus, produce the control signal of the addition ratio of a change adder, surpass the corresponding signal of signal of a setting with decay and its error ratio in demodulating equipment.
47, digital TV broadcast receiving equipment as claimed in claim 45, the selection timing when wherein input unit is selected output signal is equal to or greater than the standard value of received signal.
48, digital TV broadcast receiving equipment as claimed in claim 45, the change timing when wherein the addition ratio of adder changes is equal to or greater than the standard value of received signal.
49, digital TV broadcast receiving equipment as claimed in claim 45, the selection timing when wherein input unit is selected output signal is in the received frame of received signal, or in the interval that equals a standard value, or in arbitrary frame.
50, digital TV broadcast receiving equipment as claimed in claim 45, the change timing when wherein the addition ratio of adder changes is in the received frame of received signal, or in the interval that equals a standard value, or in arbitrary frame.
51, as any described digital TV broadcast receiving equipment of claim in the claim 5 to 14,18 to 21,32,33,44,48 and 50; wherein the time of the regulation numerical value of the magnification ratio of the delay cycle of the addition ratio of adder, deferred mount, amplifying device or phase changer renewal is the protection period of received signal, or the next-door neighbour's time of significant character before or after the cycle.
52, as any described digital TV broadcast receiving equipment of claim in the claim 7 to 51, wherein input unit comprises a plurality of antennas, and the installation site of at least one antenna in a plurality of antenna is different in time and change.
53, digital TV broadcast receiving equipment as claimed in claim 52 wherein can be controlled the distance of at least one antenna according to the wavelength of the TV signal that will receive.
54, as claim 52 or 53 described digital TV broadcast receiving equipments, the distance in wherein a plurality of antennas between the installation site of at least two antennas is shorter than the wavelength of the TV signal that will receive.
55, a kind of digital TV broadcast receiving equipment comprises:
Input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication;
Amplifying device will amplify by a plurality of signals that input unit obtains;
Deferred mount is for a plurality of signals that obtain by amplifying device provide a delay cycle;
Adder, a plurality of signals that are used for obtaining by deferred mount carry out addition;
Frequency conversion apparatus, the conversion of signals that is used for obtaining by adder is a baseband signal;
Demodulating equipment, the signal that is used for obtaining by frequency conversion apparatus carries out demodulation;
Speed detector is used to obtain the translational speed information of mobile object;
The accepting state estimating apparatus is used to obtain the multipath disturbance state;
Gain control is used for according to multipath disturbance state and translational speed information, the magnification ratio of control amplifying device; With
The delay cycle control device is used for according to multipath disturbance state and translational speed, and control will offer the delay cycle of deferred mount.
56, digital TV broadcast receiving equipment as claimed in claim 55, wherein when the translational speed of mobile object be that low speed or mobile object stop when mobile, the delay cycle control device changes delay cycle in time.
57, as claim 55 or 56 described digital TV broadcast receiving equipments, wherein the delay cycle control device is determined the variation numerical value of delay cycle according to the transmission system of received signal.
58, as any described digital TV broadcast receiving equipment of claim in the claim 55 to 57, wherein the accepting state estimating apparatus obtains the information with the input state that uses relevant input unit.
59, digital TV broadcast receiving equipment as claimed in claim 55, wherein:
Described amplifying device has a plurality of magnification ratios, to amplify a plurality of signals of telecommunication that obtain by input unit;
Described gain control, according to the receiving feature of received signal, a plurality of magnification ratios of control amplifying device.
60, as claim 55 or 56 described digital TV broadcast receiving equipments, wherein the delay cycle control device is determined the upper limit of the variable quantity of delay cycle according to the transmission system of received signal.
61, a kind of digital TV broadcast receiving equipment comprises:
Input unit is used for electromagnetic wave signal is converted to a plurality of signals of telecommunication;
Amplifying device will amplify by a plurality of signals that input unit obtains;
Phase changer is for a plurality of signals that obtain by amplifying device provide a number of phase-shift values of stipulating;
Adder, a plurality of signals that are used for obtaining by phase changer carry out addition;
Frequency conversion apparatus, the conversion of signals that is used for obtaining by adder is a baseband signal;
Demodulating equipment, the signal that is used for obtaining by frequency conversion apparatus carries out demodulation;
Speed detector is used to obtain the translational speed information of mobile object;
The accepting state estimating apparatus is used to obtain the multipath disturbance state;
Gain control is used for according to multipath disturbance state and translational speed information, the magnification ratio of control amplifying device; With
Phase control device is used to control the number of phase-shift values that will offer phase changer.
62, digital TV broadcast receiving equipment as claimed in claim 61, wherein when the translational speed of mobile object be that low speed or mobile object stop when mobile, phase control device changes the phase number of regulation in time.
63, as claim 61 or 62 described digital TV broadcast receiving equipments, wherein phase control device is determined the variation numerical value of the phase number of regulation according to the transmission system of received signal.
64, as any described digital TV broadcast receiving equipment of claim in the claim 61 to 63, wherein the accepting state estimating apparatus obtains the information with the input state that uses relevant input unit.
65, digital TV broadcast receiving equipment as claimed in claim 61, wherein:
Described amplifying device has a plurality of magnification ratios, to amplify a plurality of signals of telecommunication that obtain by input unit;
Described gain control, according to the receiving feature of received signal, a plurality of magnification ratios of control amplifying device.
66, as claim 61 or 62 described digital TV broadcast receiving equipments, wherein phase control device is according to the transmission system of received signal, determines the upper limit of variable quantity of the phase number of regulation.
67, digital TV broadcast receiving equipment as claimed in claim 32, wherein the addition control device comprises:
Gain control is used for determining the addition ratio according to postponing ripple information;
The reference signal control device is used to be provided with reference signal, makes that the phase place for the reference signal of a plurality of signals is different, and this reference signal is used when receiving system carries out frequency inverted.
68, as the described digital TV broadcast receiving equipment of claim 67, wherein postpone the ripple estimating apparatus and receive the signal of the demodulation state that expression obtains by demodulating equipment, and estimation comprise postpone intensity of wave, postpone differing between ripple and the direct wave, with respect to the delay ripple information of the delay cycle of the delay ripple of direct wave.
69, as claim 13 or 14 described digital TV broadcast receiving equipments, also comprise amplifying device, the reduction of signal gain when it is used to remedy signal distributions.
CNB991191412A 1998-09-17 1999-09-17 Digital TV broadcast receiving equipment, and transmission and receiving system Expired - Fee Related CN100370825C (en)

Applications Claiming Priority (9)

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JP26258098 1998-09-17
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JP262580/1998 1998-09-17
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EP1804494A2 (en) 2007-07-04
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CN100370825C (en) 2008-02-20
EP0987887B1 (en) 2009-09-16
KR20000023248A (en) 2000-04-25
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EP0987887A3 (en) 2006-08-30
DE69941419D1 (en) 2009-10-29

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